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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<title>Python Serialization</title>
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
<meta name="copyright" content="Copyright &#169; Miki Tebeka &lt;miki.tebeka@demandmedia.com&gt;" />
<meta name="generator" content="AsciiDoc 8.6.8" />
<style type="text/css">
/* Shared CSS for AsciiDoc xhtml11 and html5 backends */

/* Default font. */
body {
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/* Title font. */
h1, h2, h3, h4, h5, h6,
div.title, caption.title,
thead, p.table.header,
#toctitle,
#author, #revnumber, #revdate, #revremark,
#footer {
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}

body {
  margin: 1em 5% 1em 5%;
}

a {
  color: blue;
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}
a:visited {
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}

em {
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  color: navy;
}

strong {
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h1, h2, h3, h4, h5, h6 {
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h1, h2, h3 {
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h2 {
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h3 {
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h3 + * {
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h5 {
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div.sectionbody {
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}

hr {
  border: 1px solid silver;
}

p {
  margin-top: 0.5em;
  margin-bottom: 0.5em;
}

ul, ol, li > p {
  margin-top: 0;
}
ul > li     { color: #aaa; }
ul > li > * { color: black; }

.monospaced, code, pre {
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  font-size: inherit;
  color: navy;
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  margin: 0;
}


#author {
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}
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}
#revnumber, #revdate, #revremark {
}

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  margin-top: 4.0em;
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}
#footer-badges {
  float: right;
  padding-bottom: 0.5em;
}

#preamble {
  margin-top: 1.5em;
  margin-bottom: 1.5em;
}
div.imageblock, div.exampleblock, div.verseblock,
div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
div.admonitionblock {
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div.admonitionblock {
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  margin-bottom: 2.0em;
  margin-right: 10%;
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div.content { /* Block element content. */
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/* Block element titles. */
div.title, caption.title {
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  margin-top: 1.0em;
  margin-bottom: 0.5em;
}
div.title + * {
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}

td div.title:first-child {
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}
div.content div.title:first-child {
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}
div.content + div.title {
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}

div.sidebarblock > div.content {
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}

div.listingblock > div.content {
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div.verseblock > div.attribution {
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/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
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div.admonitionblock td.content {
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}

div.exampleblock > div.content {
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  padding-left: 0.5em;
}

div.imageblock div.content { padding-left: 0; }
span.image img { border-style: none; }
a.image:visited { color: white; }

dl {
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  margin-bottom: 0.8em;
}
dt {
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dd > *:first-child {
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ul, ol {
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ol.arabic {
  list-style-type: decimal;
}
ol.loweralpha {
  list-style-type: lower-alpha;
}
ol.upperalpha {
  list-style-type: upper-alpha;
}
ol.lowerroman {
  list-style-type: lower-roman;
}
ol.upperroman {
  list-style-type: upper-roman;
}

div.compact ul, div.compact ol,
div.compact p, div.compact p,
div.compact div, div.compact div {
  margin-top: 0.1em;
  margin-bottom: 0.1em;
}

tfoot {
  font-weight: bold;
}
td > div.verse {
  white-space: pre;
}

div.hdlist {
  margin-top: 0.8em;
  margin-bottom: 0.8em;
}
div.hdlist tr {
  padding-bottom: 15px;
}
dt.hdlist1.strong, td.hdlist1.strong {
  font-weight: bold;
}
td.hdlist1 {
  vertical-align: top;
  font-style: normal;
  padding-right: 0.8em;
  color: navy;
}
td.hdlist2 {
  vertical-align: top;
}
div.hdlist.compact tr {
  margin: 0;
  padding-bottom: 0;
}

.comment {
  background: yellow;
}

.footnote, .footnoteref {
  font-size: 0.8em;
}

span.footnote, span.footnoteref {
  vertical-align: super;
}

#footnotes {
  margin: 20px 0 20px 0;
  padding: 7px 0 0 0;
}

#footnotes div.footnote {
  margin: 0 0 5px 0;
}

#footnotes hr {
  border: none;
  border-top: 1px solid silver;
  height: 1px;
  text-align: left;
  margin-left: 0;
  width: 20%;
  min-width: 100px;
}

div.colist td {
  padding-right: 0.5em;
  padding-bottom: 0.3em;
  vertical-align: top;
}
div.colist td img {
  margin-top: 0.3em;
}

@media print {
  #footer-badges { display: none; }
}

#toc {
  margin-bottom: 2.5em;
}

#toctitle {
  color: #527bbd;
  font-size: 1.1em;
  font-weight: bold;
  margin-top: 1.0em;
  margin-bottom: 0.1em;
}

div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
  margin-top: 0;
  margin-bottom: 0;
}
div.toclevel2 {
  margin-left: 2em;
  font-size: 0.9em;
}
div.toclevel3 {
  margin-left: 4em;
  font-size: 0.9em;
}
div.toclevel4 {
  margin-left: 6em;
  font-size: 0.9em;
}

span.aqua { color: aqua; }
span.black { color: black; }
span.blue { color: blue; }
span.fuchsia { color: fuchsia; }
span.gray { color: gray; }
span.green { color: green; }
span.lime { color: lime; }
span.maroon { color: maroon; }
span.navy { color: navy; }
span.olive { color: olive; }
span.purple { color: purple; }
span.red { color: red; }
span.silver { color: silver; }
span.teal { color: teal; }
span.white { color: white; }
span.yellow { color: yellow; }

span.aqua-background { background: aqua; }
span.black-background { background: black; }
span.blue-background { background: blue; }
span.fuchsia-background { background: fuchsia; }
span.gray-background { background: gray; }
span.green-background { background: green; }
span.lime-background { background: lime; }
span.maroon-background { background: maroon; }
span.navy-background { background: navy; }
span.olive-background { background: olive; }
span.purple-background { background: purple; }
span.red-background { background: red; }
span.silver-background { background: silver; }
span.teal-background { background: teal; }
span.white-background { background: white; }
span.yellow-background { background: yellow; }

span.big { font-size: 2em; }
span.small { font-size: 0.6em; }

span.underline { text-decoration: underline; }
span.overline { text-decoration: overline; }
span.line-through { text-decoration: line-through; }

div.unbreakable { page-break-inside: avoid; }


/*
 * xhtml11 specific
 *
 * */

div.tableblock {
  margin-top: 1.0em;
  margin-bottom: 1.5em;
}
div.tableblock > table {
  border: 3px solid #527bbd;
}
thead, p.table.header {
  font-weight: bold;
  color: #527bbd;
}
p.table {
  margin-top: 0;
}
/* Because the table frame attribute is overriden by CSS in most browsers. */
div.tableblock > table[frame="void"] {
  border-style: none;
}
div.tableblock > table[frame="hsides"] {
  border-left-style: none;
  border-right-style: none;
}
div.tableblock > table[frame="vsides"] {
  border-top-style: none;
  border-bottom-style: none;
}


/*
 * html5 specific
 *
 * */

table.tableblock {
  margin-top: 1.0em;
  margin-bottom: 1.5em;
}
thead, p.tableblock.header {
  font-weight: bold;
  color: #527bbd;
}
p.tableblock {
  margin-top: 0;
}
table.tableblock {
  border-width: 3px;
  border-spacing: 0px;
  border-style: solid;
  border-color: #527bbd;
  border-collapse: collapse;
}
th.tableblock, td.tableblock {
  border-width: 1px;
  padding: 4px;
  border-style: solid;
  border-color: #527bbd;
}

table.tableblock.frame-topbot {
  border-left-style: hidden;
  border-right-style: hidden;
}
table.tableblock.frame-sides {
  border-top-style: hidden;
  border-bottom-style: hidden;
}
table.tableblock.frame-none {
  border-style: hidden;
}

th.tableblock.halign-left, td.tableblock.halign-left {
  text-align: left;
}
th.tableblock.halign-center, td.tableblock.halign-center {
  text-align: center;
}
th.tableblock.halign-right, td.tableblock.halign-right {
  text-align: right;
}

th.tableblock.valign-top, td.tableblock.valign-top {
  vertical-align: top;
}
th.tableblock.valign-middle, td.tableblock.valign-middle {
  vertical-align: middle;
}
th.tableblock.valign-bottom, td.tableblock.valign-bottom {
  vertical-align: bottom;
}


/*
 * manpage specific
 *
 * */

body.manpage h1 {
  padding-top: 0.5em;
  padding-bottom: 0.5em;
  border-top: 2px solid silver;
  border-bottom: 2px solid silver;
}
body.manpage h2 {
  border-style: none;
}
body.manpage div.sectionbody {
  margin-left: 3em;
}

@media print {
  body.manpage div#toc { display: none; }
}
/* slidy.css

   Copyright (c) 2005-2010 W3C (MIT, ERCIM, Keio), All Rights Reserved.
   W3C liability, trademark, document use and software licensing
   rules apply, see:

   http://www.w3.org/Consortium/Legal/copyright-documents
   http://www.w3.org/Consortium/Legal/copyright-software
*/

/*
   SJR: 2010-09-29: Modified for AsciiDoc slidy backend.
   Mostly just commented out stuff that is handled by AsciiDoc's CSS files.
*/

body
{
  margin: 0 0 0 0;
  padding: 0 0 0 0;
  width: 100%;
  height: 100%;
  color: black;
  background-color: white;
/*
  font-family: "Gill Sans MT", "Gill Sans", GillSans, sans-serif;
*/
  font-size: 14pt;
}

div.toolbar {
  position: fixed; z-index: 200;
  top: auto; bottom: 0; left: 0; right: 0;
  height: 1.2em; text-align: right;
  padding-left: 1em;
  padding-right: 1em;
  font-size: 60%;
  color: red;
  background-color: rgb(240,240,240);
  border-top: solid 1px rgb(180,180,180);
}

div.toolbar span.copyright {
  color: black;
  margin-left: 0.5em;
}

div.initial_prompt {
  position: absolute;
  z-index: 1000;
  bottom: 1.2em;
  width: 90%;
  background-color: rgb(200,200,200);
  opacity: 0.35;
  background-color: rgb(200,200,200, 0.35);
  cursor: pointer;
}

div.initial_prompt p.help {
  text-align: center;
}

div.initial_prompt p.close {
  text-align: right;
  font-style: italic;
}

div.slidy_toc {
  position: absolute;
  z-index: 300;
  width: 60%;
  max-width: 30em;
  height: 30em;
  overflow: auto;
  top: auto;
  right: auto;
  left: 4em;
  bottom: 4em;
  padding: 1em;
  background: rgb(240,240,240);
  border-style: solid;
  border-width: 2px;
  font-size: 60%;
}

div.slidy_toc .toc_heading {
  text-align: center;
  width: 100%;
  margin: 0;
  margin-bottom: 1em;
  border-bottom-style: solid;
  border-bottom-color: rgb(180,180,180);
  border-bottom-width: 1px;
}

div.slide {
  z-index: 20;
  margin: 0 0 0 0;
  padding-top: 0;
  padding-bottom: 0;
  padding-left: 20px;
  padding-right: 20px;
  border-width: 0;
  clear: both;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  line-height: 120%;
  background-color: transparent;
}

div.background {
  display: none;
}

div.handout {
  margin-left: 20px;
  margin-right: 20px;
}

div.slide.titlepage {
  text-align: center;
}

div.slide.titlepage.h1 {
  padding-top: 10%;
}

div.slide h1 {
  padding-left: 0;
  padding-right: 20pt;
  padding-top: 4pt;
  padding-bottom: 4pt;
  margin-top: 0;
  margin-left: 0;
  margin-right: 60pt;
  margin-bottom: 0.5em;
  display: block;
  font-size: 160%;
  line-height: 1.2em;
  background: transparent;
}

div.toc {
  position: absolute;
  top: auto;
  bottom: 4em;
  left: 4em;
  right: auto;
  width: 60%;
  max-width: 30em;
  height: 30em;
  border: solid thin black;
  padding: 1em;
  background: rgb(240,240,240);
  color: black;
  z-index: 300;
  overflow: auto;
  display: block;
  visibility: visible;
}

div.toc-heading {
  width: 100%;
  border-bottom: solid 1px rgb(180,180,180);
  margin-bottom: 1em;
  text-align: center;
}

/*
pre {
 font-size: 80%;
 font-weight: bold;
 line-height: 120%;
 padding-top: 0.2em;
 padding-bottom: 0.2em;
 padding-left: 1em;
 padding-right: 1em;
 border-style: solid;
 border-left-width: 1em;
 border-top-width: thin;
 border-right-width: thin;
 border-bottom-width: thin;
 border-color: #95ABD0;
 color: #00428C;
 background-color: #E4E5E7;
}
*/

/*
li pre { margin-left: 0; }

blockquote { font-style: italic }

img { background-color: transparent }

p.copyright { font-size: smaller }
*/

.center { text-align: center }
.footnote { font-size: smaller; margin-left: 2em; }

/*
a img { border-width: 0; border-style: none }
*/

a:visited { color: navy }
a:link { color: navy }
a:hover { color: red; text-decoration: underline }
a:active { color: red; text-decoration: underline }

a {text-decoration: none}
.navbar a:link {color: white}
.navbar a:visited {color: yellow}
.navbar a:active {color: red}
.navbar a:hover {color: red}

/*
ul { list-style-type: square; }
ul ul { list-style-type: disc; }
ul ul ul { list-style-type: circle; }
ul ul ul ul { list-style-type: disc; }
li { margin-left: 0.5em; margin-top: 0.5em; }
li li { font-size: 85%; font-style: italic }
li li li { font-size: 85%; font-style: normal }
*/

div dt
{
  margin-left: 0;
  margin-top: 1em;
  margin-bottom: 0.5em;
  font-weight: bold;
}
div dd
{
  margin-left: 2em;
  margin-bottom: 0.5em;
}


/*
p,pre,ul,ol,blockquote,h2,h3,h4,h5,h6,dl,table {
  margin-left: 1em;
  margin-right: 1em;
}
*/

p.subhead { font-weight: bold; margin-top: 2em; }

.smaller { font-size: smaller }
.bigger { font-size: 130% }

/*
td,th { padding: 0.2em }
*/

ul {
  margin: 0.5em 1.5em 0.5em 1.5em;
  padding: 0;
}

ol {
  margin: 0.5em 1.5em 0.5em 1.5em;
  padding: 0;
}

ul { list-style-type: square; }
ul ul { list-style-type: disc; }
ul ul ul { list-style-type: circle; }
ul ul ul ul { list-style-type: disc; }

/*
ul li {
  list-style: square;
  margin: 0.1em 0em 0.6em 0;
  padding: 0 0 0 0;
  line-height: 140%;
}

ol li {
  margin: 0.1em 0em 0.6em 1.5em;
  padding: 0 0 0 0px;
  line-height: 140%;
  list-style-type: decimal;
}

li ul li {
  font-size: 85%;
  font-style: italic;
  list-style-type: disc;
  background: transparent;
  padding: 0 0 0 0;
}
li li ul li {
  font-size: 85%;
  font-style: normal;
  list-style-type: circle;
  background: transparent;
  padding: 0 0 0 0;
}
li li li ul li {
  list-style-type: disc;
  background: transparent;
  padding: 0 0 0 0;
}

li ol li {
  list-style-type: decimal;
}


li li ol li {
  list-style-type: decimal;
}
*/

/*
 setting class="outline" on ol or ul makes it behave as an
 ouline list where blocklevel content in li elements is
 hidden by default and can be expanded or collapsed with
 mouse click. Set class="expand" on li to override default
*/

ol.outline li:hover { cursor: pointer }
ol.outline li.nofold:hover { cursor: default }

ul.outline li:hover { cursor: pointer }
ul.outline li.nofold:hover { cursor: default }

ol.outline { list-style:decimal; }
ol.outline ol { list-style-type:lower-alpha }

ol.outline li.nofold {
  padding: 0 0 0 20px;
  background: transparent url(../graphics/nofold-dim.gif) no-repeat 0px 0.5em;
}
ol.outline li.unfolded {
  padding: 0 0 0 20px;
  background: transparent url(../graphics/fold-dim.gif) no-repeat 0px 0.5em;
}
ol.outline li.folded {
  padding: 0 0 0 20px;
  background: transparent url(../graphics/unfold-dim.gif) no-repeat 0px 0.5em;
}
ol.outline li.unfolded:hover {
  padding: 0 0 0 20px;
  background: transparent url(../graphics/fold.gif) no-repeat 0px 0.5em;
}
ol.outline li.folded:hover {
  padding: 0 0 0 20px;
  background: transparent url(../graphics/unfold.gif) no-repeat 0px 0.5em;
}

ul.outline li.nofold {
  padding: 0 0 0 20px;
  background: transparent url(../graphics/nofold-dim.gif) no-repeat 0px 0.5em;
}
ul.outline li.unfolded {
  padding: 0 0 0 20px;
  background: transparent url(../graphics/fold-dim.gif) no-repeat 0px 0.5em;
}
ul.outline li.folded {
  padding: 0 0 0 20px;
  background: transparent url(../graphics/unfold-dim.gif) no-repeat 0px 0.5em;
}
ul.outline li.unfolded:hover {
  padding: 0 0 0 20px;
  background: transparent url(../graphics/fold.gif) no-repeat 0px 0.5em;
}
ul.outline li.folded:hover {
  padding: 0 0 0 20px;
  background: transparent url(../graphics/unfold.gif) no-repeat 0px 0.5em;
}

/* for slides with class "title" in table of contents */
a.titleslide { font-weight: bold; font-style: italic }

/*
 hide images for work around for save as bug
 where browsers fail to save images used by CSS
*/
img.hidden { display: none; visibility: hidden }
div.initial_prompt { display: none; visibility: hidden }

  div.slide {
     visibility: visible;
     position: inherit;
  }
  div.handout {
     border-top-style: solid;
     border-top-width: thin;
     border-top-color: black;
  }

@media screen {
  .hidden { display: none; visibility: visible }

  div.slide.hidden { display: block; visibility: visible }
  div.handout.hidden { display: block; visibility: visible }
  div.background { display: none; visibility: hidden }
  body.single_slide div.initial_prompt { display: block; visibility: visible }
  body.single_slide div.background { display: block; visibility: visible }
  body.single_slide div.background.hidden { display: none; visibility: hidden }
  body.single_slide .invisible { visibility: hidden }
  body.single_slide .hidden { display: none; visibility: hidden }
  body.single_slide div.slide { position: absolute }
  body.single_slide div.handout { display: none; visibility: hidden }
}

@media print {
  .hidden { display: block; visibility: visible }

/*
  div.slide pre { font-size: 60%; padding-left: 0.5em; }
*/
  div.toolbar { display: none; visibility: hidden; }
  div.slidy_toc { display: none; visibility: hidden; }
  div.background { display: none; visibility: hidden; }
  div.slide { page-break-before: always }
  /* :first-child isn't reliable for print media */
  div.slide.first-slide { page-break-before: avoid }
}


/* SJR: AsciiDoc slidy backend tweaks */

ol, ul {
  margin: 0.8em 1.5em 0.8em 1.8em;
}
li > ul, li > ol {
  margin-top: 0.5em;
}

.outline > li.folded,
.outline > li.unfolded {
  color: #527bbd;
}
ul > li{ color: #aaa; }
ul > li > *, ol > li > * { color: black; }

li {
  margin-top: 0.5em;
  margin-bottom: 0.5em;
}

/*
  pygmentize filter
*/
.highlight .hll { background-color: #ffffcc }
.highlight  { background: #f4f4f4; }
.highlight .c { color: #008800; font-style: italic } /* Comment */
.highlight .err { border: 1px solid #FF0000 } /* Error */
.highlight .k { color: #AA22FF; font-weight: bold } /* Keyword */
.highlight .o { color: #666666 } /* Operator */
.highlight .cm { color: #008800; font-style: italic } /* Comment.Multiline */
.highlight .cp { color: #008800 } /* Comment.Preproc */
.highlight .c1 { color: #008800; font-style: italic } /* Comment.Single */
.highlight .cs { color: #008800; font-weight: bold } /* Comment.Special */
.highlight .gd { color: #A00000 } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #FF0000 } /* Generic.Error */
.highlight .gh { color: #000080; font-weight: bold } /* Generic.Heading */
.highlight .gi { color: #00A000 } /* Generic.Inserted */
.highlight .go { color: #808080 } /* Generic.Output */
.highlight .gp { color: #000080; font-weight: bold } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #800080; font-weight: bold } /* Generic.Subheading */
.highlight .gt { color: #0040D0 } /* Generic.Traceback */
.highlight .kc { color: #AA22FF; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #AA22FF; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #AA22FF; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #AA22FF } /* Keyword.Pseudo */
.highlight .kr { color: #AA22FF; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #00BB00; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #666666 } /* Literal.Number */
.highlight .s { color: #BB4444 } /* Literal.String */
.highlight .na { color: #BB4444 } /* Name.Attribute */
.highlight .nb { color: #AA22FF } /* Name.Builtin */
.highlight .nc { color: #0000FF } /* Name.Class */
.highlight .no { color: #880000 } /* Name.Constant */
.highlight .nd { color: #AA22FF } /* Name.Decorator */
.highlight .ni { color: #999999; font-weight: bold } /* Name.Entity */
.highlight .ne { color: #D2413A; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #00A000 } /* Name.Function */
.highlight .nl { color: #A0A000 } /* Name.Label */
.highlight .nn { color: #0000FF; font-weight: bold } /* Name.Namespace */
.highlight .nt { color: #008000; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #B8860B } /* Name.Variable */
.highlight .ow { color: #AA22FF; font-weight: bold } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mf { color: #666666 } /* Literal.Number.Float */
.highlight .mh { color: #666666 } /* Literal.Number.Hex */
.highlight .mi { color: #666666 } /* Literal.Number.Integer */
.highlight .mo { color: #666666 } /* Literal.Number.Oct */
.highlight .sb { color: #BB4444 } /* Literal.String.Backtick */
.highlight .sc { color: #BB4444 } /* Literal.String.Char */
.highlight .sd { color: #BB4444; font-style: italic } /* Literal.String.Doc */
.highlight .s2 { color: #BB4444 } /* Literal.String.Double */
.highlight .se { color: #BB6622; font-weight: bold } /* Literal.String.Escape */
.highlight .sh { color: #BB4444 } /* Literal.String.Heredoc */
.highlight .si { color: #BB6688; font-weight: bold } /* Literal.String.Interpol */
.highlight .sx { color: #008000 } /* Literal.String.Other */
.highlight .sr { color: #BB6688 } /* Literal.String.Regex */
.highlight .s1 { color: #BB4444 } /* Literal.String.Single */
.highlight .ss { color: #B8860B } /* Literal.String.Symbol */
.highlight .bp { color: #AA22FF } /* Name.Builtin.Pseudo */
.highlight .vc { color: #B8860B } /* Name.Variable.Class */
.highlight .vg { color: #B8860B } /* Name.Variable.Global */
.highlight .vi { color: #B8860B } /* Name.Variable.Instance */
.highlight .il { color: #666666 } /* Literal.Number.Integer.Long */


/* Vertical lines between line numbers and code */
div.linenodiv {
    border-right:1px solid gray;
    padding-right:2px;
    margin-right:2px;
}
</style>
<script type="text/javascript">
/*<![CDATA[*/
/* slidy.js

   Copyright (c) 2005-2010 W3C (MIT, ERCIM, Keio), All Rights Reserved.
   W3C liability, trademark, document use and software licensing
   rules apply, see:

   http://www.w3.org/Consortium/Legal/copyright-documents
   http://www.w3.org/Consortium/Legal/copyright-software
*/

// the slidy object implementation
var w3c_slidy = {
  // classify which kind of browser we're running under
  ns_pos: (typeof window.pageYOffset!='undefined'),
  khtml: ((navigator.userAgent).indexOf("KHTML") >= 0 ? true : false),
  opera: ((navigator.userAgent).indexOf("Opera") >= 0 ? true : false),
  ipad: ((navigator.userAgent).indexOf("iPad") >= 0 ? true : false),
  iphone: ((navigator.userAgent).indexOf("iPhone") >= 0 ? true : false),
  ie: (typeof document.all != "undefined" && !this.opera),
  ie6: (!this.ns_pos && navigator.userAgent.indexOf("MSIE 6") != -1),
  ie7: (!this.ns_pos && navigator.userAgent.indexOf("MSIE 7") != -1),
  ie8: (!this.ns_pos && navigator.userAgent.indexOf("MSIE 8") != -1),
  ie9: (!this.ns_pos && navigator.userAgent.indexOf("MSIE 9") != -1),
  keyboardless: (this.ipad || this.iphone),

  // are we running as XHTML? (doesn't work on Opera)
  is_xhtml: /xml/.test(document.contentType),

  slide_number: 0, // integer slide count: 0, 1, 2, ...
  slide_number_element: null, // element containing slide number
  slides: [], // set to array of slide div's
  notes: [], // set to array of handout div's
  backgrounds: [], // set to array of background div's
  toolbar: null, // element containing toolbar
  title: null, // document title
  last_shown: null, // last incrementally shown item
  eos: null,  // span element for end of slide indicator
  toc: null, // table of contents
  outline: null, // outline element with the focus
  selected_text_len: 0, // length of drag selection on document
  view_all: 0,  // 1 to view all slides + handouts
  want_toolbar: true,  // user preference to show/hide toolbar
  mouse_click_enabled: true, // enables left click for next slide
  scroll_hack: 0, // IE work around for position: fixed
  disable_slide_click: false,  // used by clicked anchors

  lang: "en", // updated to language specified by html file

  help_anchor: null, // used for keyboard focus hack in showToolbar()
  help_page: "http://www.w3.org/Talks/Tools/Slidy2/help/help.html",
  help_text: "Navigate with mouse click, space bar, Cursor Left/Right, " +
             "or Pg Up and Pg Dn. Use S and B to change font size.",

  size_index: 0,
  size_adjustment: 0,
  sizes:  new Array("10pt", "12pt", "14pt", "16pt", "18pt", "20pt",
                    "22pt", "24pt", "26pt", "28pt", "30pt", "32pt"),

  // needed for efficient resizing
  last_width: 0,
  last_height: 0,


  // Needed for cross browser support for relative width/height on
  // object elements. The work around is to save width/height attributes
  // and then to recompute absolute width/height dimensions on resizing
   objects: [],

  // attach initialiation event handlers
  set_up: function () {
    var init = function() { w3c_slidy.init(); };
    if (typeof window.addEventListener != "undefined")
      window.addEventListener("load", init, false);
    else
      window.attachEvent("onload", init);
  },

  hide_slides: function () {
    if (document.body && !w3c_slidy.initialized)
      document.body.style.visibility = "hidden";
    else
      setTimeout(w3c_slidy.hide_slides, 50);
  },

  // hack to persuade IE to compute correct document height
  // as needed for simulating fixed positioning of toolbar
  ie_hack: function () {
    window.resizeBy(0,-1);
    window.resizeBy(0, 1);
  },

  init: function () {
    //alert("slidy starting test 10");
    document.body.style.visibility = "visible";
    w3c_slidy_i18n.init();
    this.add_toolbar();
    this.wrap_implicit_slides();
    this.collect_slides();
    this.collect_notes();
    this.collect_backgrounds();
    this.objects = document.body.getElementsByTagName("object");
    this.patch_anchors();
    this.slide_number = this.find_slide_number(location.href);
    window.offscreenbuffering = true;
    this.size_adjustment = this.find_size_adjust();
    this.time_left = this.find_duration();
    this.hide_image_toolbar();  // suppress IE image toolbar popup
    this.init_outliner();  // activate fold/unfold support
    this.title = document.title;

    // work around for opera bug
    this.is_xhtml = (document.body.tagName == "BODY" ? false : true);

    if (this.slides.length > 0)
    {
      var slide = this.slides[this.slide_number];

      if (this.slide_number > 0)
      {
        this.set_visibility_all_incremental("visible");
        this.last_shown = this.previous_incremental_item(null);
        this.set_eos_status(true);
      }
      else
      {
        this.last_shown = null;
        this.set_visibility_all_incremental("hidden");
        this.set_eos_status(!this.next_incremental_item(this.last_shown));
      }

      this.set_location();
      this.add_class(this.slides[0], "first-slide");
      w3c_slidy.show_slide(slide);
    }

    this.toc = this.table_of_contents();

    this.add_initial_prompt();

    // bind event handlers without interfering with custom page scripts
    // Tap events behave too weirdly to support clicks reliably on
    // iPhone and iPad, so exclude these from click handler

    if (!this.keyboardless)
      this.add_listener(document.body, "click", this.mouse_button_click);

    this.add_listener(document, "keydown", this.key_down);
    this.add_listener(document, "keypress", this.key_press);
    this.add_listener(window, "resize", this.resized);
    this.add_listener(window, "scroll", this.scrolled);
    this.add_listener(window, "unload", this.unloaded);

    if (!document.body.onclick)
      document.body.onclick = function () { };

    this.single_slide_view();

    //this.set_location();

    this.resized();

    if (this.ie7)
      setTimeout(w3c_slidy.ie_hack, 100);

    this.show_toolbar();

    // for back button detection
    setInterval(function () { w3c_slidy.check_location(); }, 200);
    w3c_slidy.initialized = true;
  },

  // create div element with links to each slide
  table_of_contents: function () {
    var toc = this.create_element("div");
    this.add_class(toc, "slidy_toc hidden");
    //toc.setAttribute("tabindex", "0");

    var heading = this.create_element("div");
    this.add_class(heading, "toc-heading");
    heading.innerHTML = "Table of Contents".localize();

    toc.appendChild(heading);
    var previous = null;

    for (var i = 0; i < this.slides.length; ++i)
    {
      var title = this.has_class(this.slides[i], "title");
      var num = document.createTextNode((i + 1) + ". ");

      toc.appendChild(num);

      var a = this.create_element("a");
      a.setAttribute("href", "#(" + (i+1) + ")");

      if (title)
        this.add_class(a, "titleslide");

      var name = document.createTextNode(this.slide_name(i));
      a.appendChild(name);
      a.onclick = w3c_slidy.toc_click;
      a.onkeydown = w3c_slidy.toc_keydown;
      a.previous = previous;

      if (previous)
        previous.next = a;

      toc.appendChild(a);

      if (i == 0)
        toc.first = a;

      if (i < this.slides.length - 1)
      {
        var br = this.create_element("br");
        toc.appendChild(br);
      }

      previous = a;
    }

    toc.focus = function () {
      if (this.first)
        this.first.focus();
    }

    toc.onmouseup = w3c_slidy.mouse_button_up;

    toc.onclick = function (e) {
      e||(e=window.event);

      if (w3c_slidy.selected_text_len <= 0)
         w3c_slidy.hide_table_of_contents();

      w3c_slidy.stop_propagation(e);

      if (e.cancel != undefined)
        e.cancel = true;

      if (e.returnValue != undefined)
        e.returnValue = false;

      return false;
    };

    document.body.insertBefore(toc, document.body.firstChild);
    return toc;
  },

  is_shown_toc: function () {
    return !w3c_slidy.has_class(w3c_slidy.toc, "hidden");
  },

  show_table_of_contents: function () {
    w3c_slidy.remove_class(w3c_slidy.toc, "hidden");
    var toc = w3c_slidy.toc;
    toc.focus();

    if (w3c_slidy.ie7 && w3c_slidy.slide_number == 0)
      setTimeout(w3c_slidy.ie_hack, 100);
  },

  hide_table_of_contents: function () {
    w3c_slidy.add_class(w3c_slidy.toc, "hidden");

    if (!w3c_slidy.opera)
      w3c_slidy.help_anchor.focus();
  },

  toggle_table_of_contents: function () {
    if (w3c_slidy.is_shown_toc())
      w3c_slidy.hide_table_of_contents();
    else
      w3c_slidy.show_table_of_contents();
  },

  // called on clicking toc entry
  toc_click: function (e) {
    if (!e)
      e = window.event;

    var target = w3c_slidy.get_target(e);

    if (target && target.nodeType == 1)
    {
      var uri = target.getAttribute("href");

      if (uri)
      {
        //alert("going to " + uri);
        var slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.hide_slide(slide);
        w3c_slidy.slide_number = w3c_slidy.find_slide_number(uri);
        slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.last_shown = null;
        w3c_slidy.set_location();
        w3c_slidy.set_visibility_all_incremental("hidden");
        w3c_slidy.set_eos_status(!w3c_slidy.next_incremental_item(w3c_slidy.last_shown));
        w3c_slidy.show_slide(slide);
        //target.focus();

        try
        {
          if (!w3c_slidy.opera)
            w3c_slidy.help_anchor.focus();
        }
        catch (e)
        {
        }
      }
    }

    w3c_slidy.hide_table_of_contents(e);
    if (w3c_slidy.ie7) w3c_slidy.ie_hack();
    w3c_slidy.stop_propagation(e);
    return w3c_slidy.cancel(e);
  },

  // called onkeydown for toc entry
  toc_keydown: function (event) {
    var key;

    if (!event)
      var event = window.event;

    // kludge around NS/IE differences
    if (window.event)
      key = window.event.keyCode;
    else if (event.which)
      key = event.which;
    else
      return true; // Yikes! unknown browser

    // ignore event if key value is zero
    // as for alt on Opera and Konqueror
    if (!key)
      return true;

    // check for concurrent control/command/alt key
    // but are these only present on mouse events?

    if (event.ctrlKey || event.altKey)
      return true;

    if (key == 13)
    {
      var uri = this.getAttribute("href");

      if (uri)
      {
        //alert("going to " + uri);
       var slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.hide_slide(slide);
        w3c_slidy.slide_number = w3c_slidy.find_slide_number(uri);
        slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.last_shown = null;
        w3c_slidy.set_location();
        w3c_slidy.set_visibility_all_incremental("hidden");
        w3c_slidy.set_eos_status(!w3c_slidy.next_incremental_item(w3c_slidy.last_shown));
        w3c_slidy.show_slide(slide);
        //target.focus();

        try
        {
          if (!w3c_slidy.opera)
            w3c_slidy.help_anchor.focus();
        }
        catch (e)
        {
        }
      }

      w3c_slidy.hide_table_of_contents();

      if (self.ie7)
       w3c_slidy.ie_hack();

      return w3c_slidy.cancel(event);
    }

    if (key == 40 && this.next)
    {
      this.next.focus();
      return w3c_slidy.cancel(event);
    }

    if (key == 38 && this.previous)
    {
      this.previous.focus();
      return w3c_slidy.cancel(event);
    }

    return true;
  },


  // ### OBSOLETE ###
  before_print: function () {
    this.show_all_slides();
    this.hide_toolbar();
    alert("before print");
  },

  // ### OBSOLETE ###
  after_print: function () {
    if (!this.view_all)
    {
      this.single_slide_view();
      this.show_toolbar();
    }
    alert("after print");
  },

  // ### OBSOLETE ###
  print_slides: function () {
    this.before_print();
    window.print();
    this.after_print();
  },

  // ### OBSOLETE ?? ###
  toggle_view: function () {
    if (this.view_all)
    {
      this.single_slide_view();
      this.show_toolbar();
      this.view_all = 0;
    }
    else
    {
      this.show_all_slides();
      this.hide_toolbar();
      this.view_all = 1;
    }
  },

  // prepare for printing  ### OBSOLETE ###
  show_all_slides: function () {
    this.remove_class(document.body, "single_slide");
    this.set_visibility_all_incremental("visible");
  },

  // restore after printing  ### OBSOLETE ###
  single_slide_view: function () {
    this.add_class(document.body, "single_slide");
    this.set_visibility_all_incremental("visible");
    this.last_shown = this.previous_incremental_item(null);
  },

  // suppress IE's image toolbar pop up
  hide_image_toolbar: function () {
    if (!this.ns_pos)
    {
      var images = document.getElementsByTagName("IMG");

      for (var i = 0; i < images.length; ++i)
        images[i].setAttribute("galleryimg", "no");
    }
  },

  unloaded: function (e) {
    //alert("unloaded");
  },

  // Safari and Konqueror don't yet support getComputedStyle()
  // and they always reload page when location.href is updated
  is_KHTML: function () {
    var agent = navigator.userAgent;
    return (agent.indexOf("KHTML") >= 0 ? true : false);
  },

  // find slide name from first h1 element
  // default to document title + slide number
  slide_name: function (index) {
    var name = null;
    var slide = this.slides[index];

    var heading = this.find_heading(slide);

    if (heading)
      name = this.extract_text(heading);

    if (!name)
      name = this.title + "(" + (index + 1) + ")";

    name.replace(/\&/g, "&amp;");
    name.replace(/\</g, "&lt;");
    name.replace(/\>/g, "&gt;");

    return name;
  },

  // find first h1 element in DOM tree
  find_heading: function (node) {
    if (!node || node.nodeType != 1)
      return null;

    if (node.nodeName == "H1" || node.nodeName == "h1")
      return node;

    var child = node.firstChild;

    while (child)
    {
      node = this.find_heading(child);

      if (node)
        return node;

      child = child.nextSibling;
    }

    return null;
  },

  // recursively extract text from DOM tree
  extract_text: function (node) {
    if (!node)
      return "";

    // text nodes
    if (node.nodeType == 3)
      return node.nodeValue;

    // elements
    if (node.nodeType == 1)
    {
      node = node.firstChild;
      var text = "";

      while (node)
      {
        text = text + this.extract_text(node);
        node = node.nextSibling;
      }

      return text;
    }

    return "";
  },

  // find copyright text from meta element
  find_copyright: function () {
    var name, content;
    var meta = document.getElementsByTagName("meta");

    for (var i = 0; i < meta.length; ++i)
    {
      name = meta[i].getAttribute("name");
      content = meta[i].getAttribute("content");

      if (name == "copyright")
        return content;
    }

    return null;
  },

  find_size_adjust: function () {
    var name, content, offset;
    var meta = document.getElementsByTagName("meta");

    for (var i = 0; i < meta.length; ++i)
    {
      name = meta[i].getAttribute("name");
      content = meta[i].getAttribute("content");

      if (name == "font-size-adjustment")
        return 1 * content;
    }

    return 1;
  },

  // <meta name="duration" content="20" />  for 20 minutes
  find_duration: function () {
    var name, content, offset;
    var meta = document.getElementsByTagName("meta");

    for (var i = 0; i < meta.length; ++i)
    {
      name = meta[i].getAttribute("name");
      content = meta[i].getAttribute("content");

      if (name == "duration")
        return 60000 * content;
    }

    return null;
  },

  replace_by_non_breaking_space: function (str) {
    for (var i = 0; i < str.length; ++i)
      str[i] = 160;
  },

  // ### CHECK ME ### is use of "li" okay for text/html?
  // for XHTML do we also need to specify namespace?
  init_outliner: function () {
    var items = document.getElementsByTagName("li");

    for (var i = 0; i < items.length; ++i)
    {
      var target = items[i];

      if (!this.has_class(target.parentNode, "outline"))
        continue;

      target.onclick = this.outline_click;
/* ### more work needed for IE6
      if (!this.ns_pos)
      {
        target.onmouseover = this.hover_outline;
        target.onmouseout = this.unhover_outline;
      }
*/
      if (this.foldable(target))
      {
        target.foldable = true;
        target.onfocus = function () {w3c_slidy.outline = this;};
        target.onblur = function () {w3c_slidy.outline = null;};

        if (!target.getAttribute("tabindex"))
          target.setAttribute("tabindex", "0");

        if (this.has_class(target, "expand"))
          this.unfold(target);
        else
          this.fold(target);
      }
      else
      {
        this.add_class(target, "nofold");
        target.visible = true;
        target.foldable = false;
      }
    }
  },

  foldable: function (item) {
    if (!item || item.nodeType != 1)
      return false;

    var node = item.firstChild;

    while (node)
    {
      if (node.nodeType == 1 && this.is_block(node))
        return true;

      node = node.nextSibling;
    }

    return false;
  },

  // ### CHECK ME ### switch to add/remove "hidden" class
  fold: function (item) {
    if (item)
    {
      this.remove_class(item, "unfolded");
      this.add_class(item, "folded");
    }

    var node = item ? item.firstChild : null;

    while (node)
    {
      if (node.nodeType == 1 && this.is_block(node)) // element
      {
         w3c_slidy.add_class(node, "hidden");
      }

      node = node.nextSibling;
    }

    item.visible = false;
  },

  // ### CHECK ME ### switch to add/remove "hidden" class
  unfold: function (item) {
    if (item)
    {
      this.add_class(item, "unfolded");
      this.remove_class(item, "folded");
    }

    var node = item ? item.firstChild : null;

    while (node)
    {
      if (node.nodeType == 1 && this.is_block(node)) // element
      {
        w3c_slidy.remove_class(node, "hidden");
      }

      node = node.nextSibling;
    }

    item.visible = true;
  },

  outline_click: function (e) {
    if (!e)
      e = window.event;

    var rightclick = false;
    var target = w3c_slidy.get_target(e);

    while (target && target.visible == undefined)
      target = target.parentNode;

    if (!target)
      return true;

    if (e.which)
      rightclick = (e.which == 3);
    else if (e.button)
      rightclick = (e.button == 2);

    if (!rightclick && target.visible != undefined)
    {
      if (target.foldable)
      {
        if (target.visible)
          w3c_slidy.fold(target);
        else
          w3c_slidy.unfold(target);
      }

      w3c_slidy.stop_propagation(e);
      e.cancel = true;
      e.returnValue = false;
    }

    return false;
  },

  add_initial_prompt: function () {
    var prompt = this.create_element("div");
    prompt.setAttribute("class", "initial_prompt");

    var p1 = this.create_element("p");
    prompt.appendChild(p1);
    p1.setAttribute("class", "help");

    if (this.keyboardless)
      p1.innerHTML = "Tap footer to move to next slide";
    else
      p1.innerHTML = "Space or Right Arrow to move to next " +
                     "slide, click help below for more details";

    this.add_listener(prompt, "click", function (e) {
      document.body.removeChild(prompt);
      w3c_slidy.stop_propagation(e);

      if (e.cancel != undefined)
        e.cancel = true;

      if (e.returnValue != undefined)
        e.returnValue = false;

      return false;
    });

    document.body.appendChild(prompt);
    this.initial_prompt = prompt;
    setTimeout(function() {document.body.removeChild(prompt);}, 5000);
  },

  add_toolbar: function () {
    var counter, page;

     this.toolbar = this.create_element("div");
     this.toolbar.setAttribute("class", "toolbar");

     // a reasonably behaved browser
     if (this.ns_pos || !this.ie6)
     {
       var right = this.create_element("div");
       right.setAttribute("style", "float: right; text-align: right");

       counter = this.create_element("span")
       counter.innerHTML = "slide".localize() + " n/m";
       right.appendChild(counter);
       this.toolbar.appendChild(right);

       var left = this.create_element("div");
       left.setAttribute("style", "text-align: left");

       // global end of slide indicator
       this.eos = this.create_element("span");
       this.eos.innerHTML = "* ";
       left.appendChild(this.eos);

       var help = this.create_element("a");
       help.setAttribute("href", this.help_page);
       help.setAttribute("title", this.help_text.localize());
       help.innerHTML = "help?".localize();
       left.appendChild(help);
       this.help_anchor = help;  // save for focus hack

       var gap1 = document.createTextNode(" ");
       left.appendChild(gap1);

       var contents = this.create_element("a");
       contents.setAttribute("href", "javascript:w3c_slidy.toggle_table_of_contents()");
       contents.setAttribute("title", "table of contents".localize());
       contents.innerHTML = "contents?".localize();
       left.appendChild(contents);

       var gap2 = document.createTextNode(" ");
       left.appendChild(gap2);

       var copyright = this.find_copyright();

       if (copyright)
       {
         var span = this.create_element("span");
         span.className = "copyright";
         span.innerHTML = copyright;
         left.appendChild(span);
       }

       this.toolbar.setAttribute("tabindex", "0");
       this.toolbar.appendChild(left);
     }
     else // IE6 so need to work around its poor CSS support
     {
       this.toolbar.style.position = (this.ie7 ? "fixed" : "absolute");
       this.toolbar.style.zIndex = "200";
       this.toolbar.style.width = "99.9%";
       this.toolbar.style.height = "1.2em";
       this.toolbar.style.top = "auto";
       this.toolbar.style.bottom = "0";
       this.toolbar.style.left = "0";
       this.toolbar.style.right = "0";
       this.toolbar.style.textAlign = "left";
       this.toolbar.style.fontSize = "60%";
       this.toolbar.style.color = "red";
       this.toolbar.borderWidth = 0;
       this.toolbar.className = "toolbar";
       this.toolbar.style.background = "rgb(240,240,240)";

       // would like to have help text left aligned
       // and page counter right aligned, floating
       // div's don't work, so instead use nested
       // absolutely positioned div's.

       var sp = this.create_element("span");
       sp.innerHTML = "&nbsp;&nbsp;*&nbsp;";
       this.toolbar.appendChild(sp);
       this.eos = sp;  // end of slide indicator

       var help = this.create_element("a");
       help.setAttribute("href", this.help_page);
       help.setAttribute("title", this.help_text.localize());
       help.innerHTML = "help?".localize();
       this.toolbar.appendChild(help);
       this.help_anchor = help;  // save for focus hack

       var gap1 = document.createTextNode(" ");
       this.toolbar.appendChild(gap1);

       var contents = this.create_element("a");
       contents.setAttribute("href", "javascript:toggleTableOfContents()");
       contents.setAttribute("title", "table of contents".localize());
       contents.innerHTML = "contents?".localize();
       this.toolbar.appendChild(contents);

       var gap2 = document.createTextNode(" ");
       this.toolbar.appendChild(gap2);

       var copyright = this.find_copyright();

       if (copyright)
       {
         var span = this.create_element("span");
         span.innerHTML = copyright;
         span.style.color = "black";
         span.style.marginLeft = "0.5em";
         this.toolbar.appendChild(span);
       }

       counter = this.create_element("div")
       counter.style.position = "absolute";
       counter.style.width = "auto"; //"20%";
       counter.style.height = "1.2em";
       counter.style.top = "auto";
       counter.style.bottom = 0;
       counter.style.right = "0";
       counter.style.textAlign = "right";
       counter.style.color = "red";
       counter.style.background = "rgb(240,240,240)";

       counter.innerHTML = "slide".localize() + " n/m";
       this.toolbar.appendChild(counter);
     }

     // ensure that click isn't passed through to the page
     this.toolbar.onclick =
         function (e) {
           if (!e)
             e = window.event;

           var target = e.target;

           if (!target && e.srcElement)
             target = e.srcElement;

           // work around Safari bug
           if (target && target.nodeType == 3)
             target = target.parentNode;

           w3c_slidy.stop_propagation(e);

           if (target && target.nodeName.toLowerCase() != "a")
             w3c_slidy.mouse_button_click(e);
         };

     this.slide_number_element = counter;
     this.set_eos_status(false);
     document.body.appendChild(this.toolbar);
  },

  // wysiwyg editors make it hard to use div elements
  // e.g. amaya loses the div when you copy and paste
  // this function wraps div elements around implicit
  // slides which start with an h1 element and continue
  // up to the next heading or div element
  wrap_implicit_slides: function () {
    var i, heading, node, next, div;
    var headings = document.getElementsByTagName("h1");

    if (!headings)
      return;

    for (i = 0; i < headings.length; ++i)
    {
      heading = headings[i];

      if (heading.parentNode != document.body)
        continue;

      node = heading.nextSibling;

      div = document.createElement("div");
      this.add_class(div, "slide");
      document.body.replaceChild(div, heading);
      div.appendChild(heading);

      while (node)
      {
        if (node.nodeType == 1 &&    // an element
             (node.nodeName == "H1" ||
              node.nodeName == "h1" ||
              node.nodeName == "DIV" ||
              node.nodeName == "div"))
          break;

        next = node.nextSibling;
        node = document.body.removeChild(node);
        div.appendChild(node);
        node = next;
      }
    }
  },

// return new array of all slides
  collect_slides: function () {
    var slides = new Array();
    var divs = document.body.getElementsByTagName("div");

    for (var i = 0; i < divs.length; ++i)
    {
      div = divs.item(i);

      if (this.has_class(div, "slide"))
      {
        // add slide to collection
        slides[slides.length] = div;

        // hide each slide as it is found
        this.add_class(div, "hidden");

        // add dummy <br/> at end for scrolling hack
        var node1 = document.createElement("br");
        div.appendChild(node1);
        var node2 = document.createElement("br");
        div.appendChild(node2);
      }
      else if (this.has_class(div, "background"))
      {  // work around for Firefox SVG reload bug
        // which otherwise replaces 1st SVG graphic with 2nd
        div.style.display = "block";
      }
    }

    this.slides = slides;
  },

  // return new array of all <div class="handout">
  collect_notes: function () {
    var notes = new Array();
    var divs = document.body.getElementsByTagName("div");

    for (var i = 0; i < divs.length; ++i)
    {
      div = divs.item(i);

      if (this.has_class(div, "handout"))
      {
        // add note to collection
        notes[notes.length] = div;

        // and hide it
        this.add_class(div, "hidden");
      }
    }

    this.notes = notes;
  },

  // return new array of all <div class="background">
  // including named backgrounds e.g. class="background titlepage"
  collect_backgrounds: function () {
    var backgrounds = new Array();
    var divs = document.body.getElementsByTagName("div");

    for (var i = 0; i < divs.length; ++i)
    {
      div = divs.item(i);

      if (this.has_class(div, "background"))
      {
        // add background to collection
        backgrounds[backgrounds.length] = div;

        // and hide it
        this.add_class(div, "hidden");
      }
    }

    this.backgrounds = backgrounds;
  },

  // set click handlers on all anchors
  patch_anchors: function () {
    var self = w3c_slidy;
    var handler = function (event) {
      // compare this.href with location.href
      // for link to another slide in this doc

      if (self.page_address(this.href) == self.page_address(location.href))
      {
        // yes, so find new slide number
        var newslidenum = self.find_slide_number(this.href);

        if (newslidenum != self.slide_number)
        {
          var slide = self.slides[self.slide_number];
          self.hide_slide(slide);
          self.slide_number = newslidenum;
          slide = self.slides[self.slide_number];
          self.show_slide(slide);
          self.set_location();
        }
      }
      else if (this.target == null)
        location.href = this.href;

      this.blur();
      self.disable_slide_click = true;
    };

    var anchors = document.body.getElementsByTagName("a");

    for (var i = 0; i < anchors.length; ++i)
    {
      if (window.addEventListener)
        anchors[i].addEventListener("click", handler, false);
      else
        anchors[i].attachEvent("onclick", handler);
    }
  },

  // ### CHECK ME ### see which functions are invoked via setTimeout
  // either directly or indirectly for use of w3c_slidy vs this
  show_slide_number: function () {
    var timer = w3c_slidy.get_timer();
    w3c_slidy.slide_number_element.innerHTML = timer + "slide".localize() + " " +
           (w3c_slidy.slide_number + 1) + "/" + w3c_slidy.slides.length;
  },

  // every 200mS check if the location has been changed as a
  // result of the user activating the Back button/menu item
  // doesn't work for Opera < 9.5
  check_location: function () {
    var hash = location.hash;

    if (w3c_slidy.slide_number > 0 && (hash == "" || hash == "#"))
      w3c_slidy.goto_slide(0);
    else if (hash.length > 2 && hash != "#("+(w3c_slidy.slide_number+1)+")")
    {
      var num = parseInt(location.hash.substr(2));

      if (!isNaN(num))
        w3c_slidy.goto_slide(num-1);
    }

    if (w3c_slidy.time_left && w3c_slidy.slide_number > 0)
    {
      w3c_slidy.show_slide_number();

      if (w3c_slidy.time_left > 0)
        w3c_slidy.time_left -= 200;
    }
  },

  get_timer: function () {
    var timer = "";
    if (w3c_slidy.time_left)
    {
      var mins, secs;
      secs = Math.floor(w3c_slidy.time_left/1000);
      mins = Math.floor(secs / 60);
      secs = secs % 60;
      timer = (mins ? mins+"m" : "") + secs + "s ";
    }

    return timer;
  },

  // this doesn't push location onto history stack for IE
  // for which a hidden iframe hack is needed: load page into
  // the iframe with script that set's parent's location.hash
  // but that won't work for standalone use unless we can
  // create the page dynamically via a javascript: URL
  set_location: function () {
     var uri = w3c_slidy.page_address(location.href);
     var hash = "#(" + (w3c_slidy.slide_number+1) + ")";

     if (w3c_slidy.slide_number >= 0)
       uri = uri + hash;

     if (w3c_slidy.ie && !w3c_slidy.ie8)
       w3c_slidy.push_hash(hash);

     if (uri != location.href) // && !khtml
        location.href = uri;

     if (this.khtml)
        hash = "(" + (w3c_slidy.slide_number+1) + ")";

     if (!this.ie && location.hash != hash && location.hash != "")
       location.hash = hash;

     document.title = w3c_slidy.title + " (" + (w3c_slidy.slide_number+1) + ")";
     w3c_slidy.show_slide_number();
  },

  page_address: function (uri) {
    var i = uri.indexOf("#");

    if (i < 0)
      i = uri.indexOf("%23");

    // check if anchor is entire page

    if (i < 0)
      return uri;  // yes

    return uri.substr(0, i);
  },

  // only used for IE6 and IE7
  on_frame_loaded: function (hash) {
    location.hash = hash;
    var uri = w3c_slidy.page_address(location.href);
    location.href = uri + hash;
  },

  // history hack with thanks to Bertrand Le Roy
  push_hash: function (hash) {
    if (hash == "") hash = "#(1)";
      window.location.hash = hash;

    var doc = document.getElementById("historyFrame").contentWindow.document;
    doc.open("javascript:'<html></html>'");
    // PWL modified this string literal to break the close script tag
    // which otherwise gets parsed when incorporated
    doc.write("<html><head><script type=\"text/javascript\">window.parent.w3c_slidy.on_frame_loaded('"+
      (hash) + "');</" + "script></head><body>hello mum</body></html>");
    doc.close();
    },

  // find current slide based upon location
  // first find target anchor and then look
  // for associated div element enclosing it
  // finally map that to slide number
  find_slide_number: function (uri) {
    // first get anchor from page location

    var i = uri.indexOf("#");

    // check if anchor is entire page
    if (i < 0)
      return 0;  // yes

    var anchor = unescape(uri.substr(i+1));

    // now use anchor as XML ID to find target
    var target = document.getElementById(anchor);

    if (!target)
    {
      // does anchor look like "(2)" for slide 2 ??
      // where first slide is (1)
      var re = /\((\d)+\)/;

      if (anchor.match(re))
      {
        var num = parseInt(anchor.substring(1, anchor.length-1));

        if (num > this.slides.length)
          num = 1;

        if (--num < 0)
          num = 0;

        return num;
      }

      // accept [2] for backwards compatibility
      re = /\[(\d)+\]/;

      if (anchor.match(re))
      {
         var num = parseInt(anchor.substring(1, anchor.length-1));

         if (num > this.slides.length)
            num = 1;

         if (--num < 0)
            num = 0;

         return num;
      }

      // oh dear unknown anchor
      return 0;
    }

    // search for enclosing slide

    while (true)
    {
      // browser coerces html elements to uppercase!
      if (target.nodeName.toLowerCase() == "div" &&
            this.has_class(target, "slide"))
      {
        // found the slide element
        break;
      }

      // otherwise try parent element if any

      target = target.parentNode;

      if (!target)
      {
        return 0;   // no luck!
      }
    };

    for (i = 0; i < slides.length; ++i)
    {
      if (slides[i] == target)
        return i;  // success
    }

    // oh dear still no luck
    return 0;
  },

  previous_slide: function (incremental) {
    if (!w3c_slidy.view_all)
    {
      var slide;

      if ((incremental || w3c_slidy.slide_number == 0) && w3c_slidy.last_shown != null)
      {
        w3c_slidy.last_shown = w3c_slidy.hide_previous_item(w3c_slidy.last_shown);
        w3c_slidy.set_eos_status(false);
      }
      else if (w3c_slidy.slide_number > 0)
      {
        slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.hide_slide(slide);

        w3c_slidy.slide_number = w3c_slidy.slide_number - 1;
        slide = w3c_slidy.slides[w3c_slidy.slide_number];
        w3c_slidy.set_visibility_all_incremental("visible");
        w3c_slidy.last_shown = w3c_slidy.previous_incremental_item(null);
        w3c_slidy.set_eos_status(true);
        w3c_slidy.show_slide(slide);
      }

      w3c_slidy.set_location();

      if (!w3c_slidy.ns_pos)
        w3c_slidy.refresh_toolbar(200);
    }
  },

  next_slide: function (incremental) {
    if (!w3c_slidy.view_all)
    {
      var slide, last = w3c_slidy.last_shown;

      if (incremental || w3c_slidy.slide_number == w3c_slidy.slides.length - 1)
         w3c_slidy.last_shown = w3c_slidy.reveal_next_item(w3c_slidy.last_shown);

      if ((!incremental || w3c_slidy.last_shown == null) &&
             w3c_slidy.slide_number < w3c_slidy.slides.length - 1)
      {
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.hide_slide(slide);

         w3c_slidy.slide_number = w3c_slidy.slide_number + 1;
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.last_shown = null;
         w3c_slidy.set_visibility_all_incremental("hidden");
         w3c_slidy.show_slide(slide);
      }
      else if (!w3c_slidy.last_shown)
      {
         if (last && incremental)
           w3c_slidy.last_shown = last;
      }

      w3c_slidy.set_location();

      w3c_slidy.set_eos_status(!w3c_slidy.next_incremental_item(w3c_slidy.last_shown));

      if (!w3c_slidy.ns_pos)
         w3c_slidy.refresh_toolbar(200);
     }
  },

  // to first slide with nothing revealed
  // i.e. state at start of presentation
  first_slide: function () {
     if (!w3c_slidy.view_all)
     {
       var slide;

       if (w3c_slidy.slide_number != 0)
       {
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.hide_slide(slide);

         w3c_slidy.slide_number = 0;
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.last_shown = null;
         w3c_slidy.set_visibility_all_incremental("hidden");
         w3c_slidy.show_slide(slide);
       }

       w3c_slidy.set_eos_status(
         !w3c_slidy.next_incremental_item(w3c_slidy.last_shown));
       w3c_slidy.set_location();
     }
  },

  // goto last slide with everything revealed
  // i.e. state at end of presentation
  last_slide: function () {
    if (!w3c_slidy.view_all)
    {
      var slide;

      w3c_slidy.last_shown = null; //revealNextItem(lastShown);

      if (w3c_slidy.last_shown == null &&
          w3c_slidy.slide_number < w3c_slidy.slides.length - 1)
      {
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.hide_slide(slide);
         w3c_slidy.slide_number = w3c_slidy.slides.length - 1;
         slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.set_visibility_all_incremental("visible");
         w3c_slidy.last_shown = w3c_slidy.previous_incremental_item(null);

         w3c_slidy.show_slide(slide);
      }
      else
      {
         w3c_slidy.set_visibility_all_incremental("visible");
         w3c_slidy.last_shown = w3c_slidy.previous_incremental_item(null);
      }

      w3c_slidy.set_eos_status(true);
      w3c_slidy.set_location();
    }
  },


  // ### check this and consider add/remove class
  set_eos_status: function (state) {
    if (this.eos)
      this.eos.style.color = (state ? "rgb(240,240,240)" : "red");
  },

  // first slide is 0
  goto_slide: function (num) {
    //alert("going to slide " + (num+1));
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];
    w3c_slidy.hide_slide(slide);
    w3c_slidy.slide_number = num;
    slide = w3c_slidy.slides[w3c_slidy.slide_number];
    w3c_slidy.last_shown = null;
    w3c_slidy.set_visibility_all_incremental("hidden");
    w3c_slidy.set_eos_status(!w3c_slidy.next_incremental_item(w3c_slidy.last_shown));
    document.title = w3c_slidy.title + " (" + (w3c_slidy.slide_number+1) + ")";
    w3c_slidy.show_slide(slide);
    w3c_slidy.show_slide_number();
  },


  show_slide: function (slide) {
    this.sync_background(slide);
    window.scrollTo(0,0);
    this.remove_class(slide, "hidden");
  },

  hide_slide: function (slide) {
    this.add_class(slide, "hidden");
  },

  // show just the backgrounds pertinent to this slide
  // when slide background-color is transparent
  // this should now work with rgba color values
  sync_background: function (slide) {
    var background;
    var bgColor;

    if (slide.currentStyle)
      bgColor = slide.currentStyle["backgroundColor"];
    else if (document.defaultView)
    {
      var styles = document.defaultView.getComputedStyle(slide,null);

      if (styles)
        bgColor = styles.getPropertyValue("background-color");
      else // broken implementation probably due Safari or Konqueror
      {
        //alert("defective implementation of getComputedStyle()");
        bgColor = "transparent";
      }
    }
    else
      bgColor == "transparent";

    if (bgColor == "transparent" ||
        bgColor.indexOf("rgba") >= 0 ||
        bgColor.indexOf("opacity") >= 0)
    {
      var slideClass = this.get_class_list(slide);

      for (var i = 0; i < this.backgrounds.length; i++)
      {
        background = this.backgrounds[i];

        var bgClass = this.get_class_list(background);

        if (this.matching_background(slideClass, bgClass))
          this.remove_class(background, "hidden");
        else
          this.add_class(background, "hidden");
      }
    }
    else // forcibly hide all backgrounds
      this.hide_backgrounds();
  },

  hide_backgrounds: function () {
    for (var i = 0; i < this.backgrounds.length; i++)
    {
      background = this.backgrounds[i];
      this.add_class(background, "hidden");
    }
  },

  // compare classes for slide and background
  matching_background: function (slideClass, bgClass) {
    var i, count, pattern, result;

    // define pattern as regular expression
    pattern = /\w+/g;

    // check background class names
    result = bgClass.match(pattern);

    for (i = count = 0; i < result.length; i++)
    {
      if (result[i] == "hidden")
        continue;

      if (result[i] == "background")
	continue;

      ++count;
    }

    if (count == 0)  // default match
      return true;

    // check for matches and place result in array
    result = slideClass.match(pattern);

    // now check if desired name is present for background
    for (i = count = 0; i < result.length; i++)
    {
      if (result[i] == "hidden")
        continue;

      if (this.has_token(bgClass, result[i]))
        return true;
    }

    return false;
  },

  resized: function () {
     var width = 0;

     if ( typeof( window.innerWidth ) == 'number' )
       width = window.innerWidth;  // Non IE browser
     else if (document.documentElement && document.documentElement.clientWidth)
       width = document.documentElement.clientWidth;  // IE6
     else if (document.body && document.body.clientWidth)
       width = document.body.clientWidth; // IE4

     var height = 0;

     if ( typeof( window.innerHeight ) == 'number' )
       height = window.innerHeight;  // Non IE browser
     else if (document.documentElement && document.documentElement.clientHeight)
       height = document.documentElement.clientHeight;  // IE6
     else if (document.body && document.body.clientHeight)
       height = document.body.clientHeight; // IE4

     if (height && (width/height > 1.05*1024/768))
     {
       width = height * 1024.0/768;
     }

     // IE fires onresize even when only font size is changed!
     // so we do a check to avoid blocking < and > actions
     if (width != w3c_slidy.last_width || height != w3c_slidy.last_height)
     {
       if (width >= 1100)
         w3c_slidy.size_index = 5;    // 4
       else if (width >= 1000)
         w3c_slidy.size_index = 4;    // 3
       else if (width >= 800)
         w3c_slidy.size_index = 3;    // 2
       else if (width >= 600)
         w3c_slidy.size_index = 2;    // 1
       else if (width)
         w3c_slidy.size_index = 0;

       // add in font size adjustment from meta element e.g.
       // <meta name="font-size-adjustment" content="-2" />
       // useful when slides have too much content ;-)

       if (0 <= w3c_slidy.size_index + w3c_slidy.size_adjustment &&
             w3c_slidy.size_index + w3c_slidy.size_adjustment < w3c_slidy.sizes.length)
         w3c_slidy.size_index = w3c_slidy.size_index + w3c_slidy.size_adjustment;

       // enables cross browser use of relative width/height
       // on object elements for use with SVG and Flash media
       w3c_slidy.adjust_object_dimensions(width, height);

       if (document.body.style.fontSize != w3c_slidy.sizes[w3c_slidy.size_index])
       {
         document.body.style.fontSize = w3c_slidy.sizes[w3c_slidy.size_index];
       }

       w3c_slidy.last_width = width;
       w3c_slidy.last_height = height;

       // force reflow to work around Mozilla bug
       if (w3c_slidy.ns_pos)
       {
         var slide = w3c_slidy.slides[w3c_slidy.slide_number];
         w3c_slidy.hide_slide(slide);
         w3c_slidy.show_slide(slide);
       }

       // force correct positioning of toolbar
       w3c_slidy.refresh_toolbar(200);
     }
  },

  scrolled: function () {
    if (w3c_slidy.toolbar && !w3c_slidy.ns_pos && !w3c_slidy.ie7)
    {
      w3c_slidy.hack_offset = w3c_slidy.scroll_x_offset();
      // hide toolbar
      w3c_slidy.toolbar.style.display = "none";

      // make it reappear later
      if (w3c_slidy.scrollhack == 0 && !w3c_slidy.view_all)
      {
        setTimeout(function () {w3c_slidy.show_toolbar(); }, 1000);
        w3c_slidy.scrollhack = 1;
      }
    }
  },

  hide_toolbar: function () {
    w3c_slidy.add_class(w3c_slidy.toolbar, "hidden");
    window.focus();
  },

  // used to ensure IE refreshes toolbar in correct position
  refresh_toolbar: function (interval) {
    if (!w3c_slidy.ns_pos && !w3c_slidy.ie7)
    {
      w3c_slidy.hide_toolbar();
      setTimeout(function () {w3c_slidy.show_toolbar(); }, interval);
    }
  },

  // restores toolbar after short delay
  show_toolbar: function () {
    if (w3c_slidy.want_toolbar)
    {
      w3c_slidy.toolbar.style.display = "block";

      if (!w3c_slidy.ns_pos)
      {
        // adjust position to allow for scrolling
        var xoffset = w3c_slidy.scroll_x_offset();
        w3c_slidy.toolbar.style.left = xoffset;
        w3c_slidy.toolbar.style.right = xoffset;

        // determine vertical scroll offset
        //var yoffset = scrollYOffset();

        // bottom is doc height - window height - scroll offset
        //var bottom = documentHeight() - lastHeight - yoffset

        //if (yoffset > 0 || documentHeight() > lastHeight)
        //   bottom += 16;  // allow for height of scrollbar

        w3c_slidy.toolbar.style.bottom = 0; //bottom;
      }

      w3c_slidy.remove_class(w3c_slidy.toolbar, "hidden");
    }

    w3c_slidy.scrollhack = 0;


    // set the keyboard focus to the help link on the
    // toolbar to ensure that document has the focus
    // IE doesn't always work with window.focus()
    // and this hack has benefit of Enter for help

    try
    {
      if (!w3c_slidy.opera)
        w3c_slidy.help_anchor.focus();
    }
    catch (e)
    {
    }
  },

// invoked via F key
  toggle_toolbar: function () {
    if (!w3c_slidy.view_all)
    {
      if (w3c_slidy.has_class(w3c_slidy.toolbar, "hidden"))
      {
        w3c_slidy.remove_class(w3c_slidy.toolbar, "hidden")
        w3c_slidy.want_toolbar = 1;
      }
      else
      {
        w3c_slidy.add_class(w3c_slidy.toolbar, "hidden")
        w3c_slidy.want_toolbar = 0;
      }
    }
  },

  scroll_x_offset: function () {
    if (window.pageXOffset)
      return self.pageXOffset;

    if (document.documentElement &&
             document.documentElement.scrollLeft)
      return document.documentElement.scrollLeft;

    if (document.body)
      return document.body.scrollLeft;

    return 0;
  },

  scroll_y_offset: function () {
    if (window.pageYOffset)
      return self.pageYOffset;

    if (document.documentElement &&
             document.documentElement.scrollTop)
      return document.documentElement.scrollTop;

    if (document.body)
      return document.body.scrollTop;

    return 0;
  },

  // looking for a way to determine height of slide content
  // the slide itself is set to the height of the window
  optimize_font_size: function () {
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];

    //var dh = documentHeight(); //getDocHeight(document);
    var dh = slide.scrollHeight;
    var wh = getWindowHeight();
    var u = 100 * dh / wh;

    alert("window utilization = " + u + "% (doc "
      + dh + " win " + wh + ")");
  },

  // from document object
  get_doc_height: function (doc) {
    if (!doc)
      doc = document;

    if (doc && doc.body && doc.body.offsetHeight)
      return doc.body.offsetHeight;  // ns/gecko syntax

    if (doc && doc.body && doc.body.scrollHeight)
      return doc.body.scrollHeight;

    alert("couldn't determine document height");
  },

  get_window_height: function () {
    if ( typeof( window.innerHeight ) == 'number' )
      return window.innerHeight;  // Non IE browser

    if (document.documentElement && document.documentElement.clientHeight)
      return document.documentElement.clientHeight;  // IE6

    if (document.body && document.body.clientHeight)
      return document.body.clientHeight; // IE4
  },

  document_height: function () {
    var sh, oh;

    sh = document.body.scrollHeight;
    oh = document.body.offsetHeight;

    if (sh && oh)
    {
      return (sh > oh ? sh : oh);
    }

    // no idea!
    return 0;
  },

  smaller: function () {
    if (w3c_slidy.size_index > 0)
    {
      --w3c_slidy.size_index;
    }

    w3c_slidy.toolbar.style.display = "none";
    document.body.style.fontSize = w3c_slidy.sizes[w3c_slidy.size_index];
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];
    w3c_slidy.hide_slide(slide);
    w3c_slidy.show_slide(slide);
    setTimeout(function () {w3c_slidy.show_toolbar(); }, 50);
  },

  bigger: function () {
    if (w3c_slidy.size_index < w3c_slidy.sizes.length - 1)
    {
      ++w3c_slidy.size_index;
    }

    w3c_slidy.toolbar.style.display = "none";
    document.body.style.fontSize = w3c_slidy.sizes[w3c_slidy.size_index];
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];
    w3c_slidy.hide_slide(slide);
    w3c_slidy.show_slide(slide);
    setTimeout(function () {w3c_slidy.show_toolbar(); }, 50);
  },

  // enables cross browser use of relative width/height
  // on object elements for use with SVG and Flash media
  // with thanks to Ivan Herman for the suggestion
  adjust_object_dimensions: function (width, height) {
    for( var i = 0; i < w3c_slidy.objects.length; i++ )
    {
      var obj = this.objects[i];
      var mimeType = obj.getAttribute("type");

      if (mimeType == "image/svg+xml" || mimeType == "application/x-shockwave-flash")
      {
        if ( !obj.initialWidth )
          obj.initialWidth = obj.getAttribute("width");

        if ( !obj.initialHeight )
          obj.initialHeight = obj.getAttribute("height");

        if ( obj.initialWidth && obj.initialWidth.charAt(obj.initialWidth.length-1) == "%" )
        {
          var w = parseInt(obj.initialWidth.slice(0, obj.initialWidth.length-1));
          var newW = width * (w/100.0);
          obj.setAttribute("width",newW);
        }

        if ( obj.initialHeight &&
             obj.initialHeight.charAt(obj.initialHeight.length-1) == "%" )
        {
          var h = parseInt(obj.initialHeight.slice(0, obj.initialHeight.length-1));
          var newH = height * (h/100.0);
          obj.setAttribute("height", newH);
        }
      }
    }
  },

  // needed for Opera to inhibit default behavior
  // since Opera delivers keyPress even if keyDown
  // was cancelled
  key_press: function (event) {
    if (!event)
      event = window.event;

    if (!w3c_slidy.key_wanted)
      return w3c_slidy.cancel(event);

    return true;
  },

  //  See e.g. http://www.quirksmode.org/js/events/keys.html for keycodes
  key_down: function (event) {
    var key;

    w3c_slidy.key_wanted = true;

    if (!event)
      event = window.event;

    // kludge around NS/IE differences
    if (window.event)
      key = window.event.keyCode;
    else if (event.which)
      key = event.which;
    else
      return true; // Yikes! unknown browser

    // ignore event if key value is zero
    // as for alt on Opera and Konqueror
    if (!key)
       return true;

    // check for concurrent control/command/alt key
    // but are these only present on mouse events?

    if (event.ctrlKey || event.altKey || event.metaKey)
       return true;

    // dismiss table of contents if visible
    if (w3c_slidy.is_shown_toc() && key != 9 && key != 16 && key != 38 && key != 40)
    {
      w3c_slidy.hide_table_of_contents();

      if (key == 27 || key == 84 || key == 67)
        return w3c_slidy.cancel(event);
    }

    if (key == 34) // Page Down
    {
      if (w3c_slidy.view_all)
        return true;

      w3c_slidy.next_slide(false);
      return w3c_slidy.cancel(event);
    }
    else if (key == 33) // Page Up
    {
      if (w3c_slidy.view_all)
        return true;

      w3c_slidy.previous_slide(false);
      return w3c_slidy.cancel(event);
    }
    else if (key == 32) // space bar
    {
      w3c_slidy.next_slide(true);
      return w3c_slidy.cancel(event);
    }
    else if (key == 37) // Left arrow
    {
      w3c_slidy.previous_slide(!event.shiftKey);
      return w3c_slidy.cancel(event);
    }
    else if (key == 36) // Home
    {
      w3c_slidy.first_slide();
      return w3c_slidy.cancel(event);
    }
    else if (key == 35) // End
    {
      w3c_slidy.last_slide();
      return w3c_slidy.cancel(event);
    }
    else if (key == 39) // Right arrow
    {
      w3c_slidy.next_slide(!event.shiftKey);
      return w3c_slidy.cancel(event);
    }
    else if (key == 13) // Enter
    {
      if (w3c_slidy.outline)
      {
        if (w3c_slidy.outline.visible)
          w3c_slidy.fold(w3c_slidy.outline);
        else
          w3c_slidy.unfold(w3c_slidy.outline);

       return w3c_slidy.cancel(event);
      }
    }
    else if (key == 188)  // < for smaller fonts
    {
      w3c_slidy.smaller();
      return w3c_slidy.cancel(event);
    }
    else if (key == 190)  // > for larger fonts
    {
      w3c_slidy.bigger();
      return w3c_slidy.cancel(event);
    }
    else if (key == 189 || key == 109)  // - for smaller fonts
    {
      w3c_slidy.smaller();
      return w3c_slidy.cancel(event);
    }
    else if (key == 187 || key == 191 || key == 107)  // = +  for larger fonts
    {
      w3c_slidy.bigger();
      return w3c_slidy.cancel(event);
    }
    else if (key == 83)  // S for smaller fonts
    {
      w3c_slidy.smaller();
      return w3c_slidy.cancel(event);
    }
    else if (key == 66)  // B for larger fonts
    {
      w3c_slidy.bigger();
      return w3c_slidy.cancel(event);
    }
    else if (key == 90)  // Z for last slide
    {
      w3c_slidy.last_slide();
      return w3c_slidy.cancel(event);
    }
    else if (key == 70)  // F for toggle toolbar
    {
      w3c_slidy.toggle_toolbar();
      return w3c_slidy.cancel(event);
    }
    else if (key == 65)  // A for toggle view single/all slides
    {
      w3c_slidy.toggle_view();
      return w3c_slidy.cancel(event);
    }
    else if (key == 75)  // toggle action of left click for next page
    {
      w3c_slidy.mouse_click_enabled = !w3c_slidy.mouse_click_enabled;
      var alert_msg = (w3c_slidy.mouse_click_enabled ?
                "enabled" : "disabled") +  " mouse click advance";

      alert(alert_msg.localize());
      return w3c_slidy.cancel(event);
    }
    else if (key == 84 || key == 67)  // T or C for table of contents
    {
      if (w3c_slidy.toc)
        w3c_slidy.toggle_table_of_contents();

      return w3c_slidy.cancel(event);
    }
    else if (key == 72) // H for help
    {
      window.location = w3c_slidy.help_page;
      return w3c_slidy.cancel(event);
    }
    //else alert("key code is "+ key);

    return true;
  },

  // safe for both text/html and application/xhtml+xml
  create_element: function (name) {
    if (this.xhtml && (typeof document.createElementNS != 'undefined'))
      return document.createElementNS("http://www.w3.org/1999/xhtml", name)

    return document.createElement(name);
  },

  get_element_style: function (elem, IEStyleProp, CSSStyleProp) {
    if (elem.currentStyle)
    {
      return elem.currentStyle[IEStyleProp];
    }
    else if (window.getComputedStyle)
    {
      var compStyle = window.getComputedStyle(elem, "");
      return compStyle.getPropertyValue(CSSStyleProp);
    }
    return "";
  },

  // the string str is a whitespace separated list of tokens
  // test if str contains a particular token, e.g. "slide"
  has_token: function (str, token) {
    if (str)
    {
      // define pattern as regular expression
      var pattern = /\w+/g;

      // check for matches
      // place result in array
      var result = str.match(pattern);

      // now check if desired token is present
      for (var i = 0; i < result.length; i++)
      {
        if (result[i] == token)
          return true;
      }
    }

    return false;
  },

  get_class_list: function (element) {
    if (typeof element.className != 'undefined')
      return element.className;

    return element.getAttribute("class");
  },

  has_class: function (element, name) {
    if (element.nodeType != 1)
      return false;

    var regexp = new RegExp("(^| )" + name + "\W*");

    if (typeof element.className != 'undefined')
      return regexp.test(element.className);

    return regexp.test(element.getAttribute("class"));
  },

  remove_class: function (element, name) {
    var regexp = new RegExp("(^| )" + name + "\W*");
    var clsval = "";

    if (typeof element.className != 'undefined')
    {
      clsval = element.className;

      if (clsval)
      {
        clsval = clsval.replace(regexp, "");
        element.className = clsval;
      }
    }
    else
    {
      clsval = element.getAttribute("class");

      if (clsval)
      {
        clsval = clsval.replace(regexp, "");
        element.setAttribute("class", clsval);
      }
    }
  },

  add_class: function (element, name) {
    if (!this.has_class(element, name))
    {
      if (typeof element.className != 'undefined')
        element.className += " " + name;
      else
      {
        var clsval = element.getAttribute("class");
        clsval = clsval ? clsval + " " + name : name;
        element.setAttribute("class", clsval);
      }
    }
  },

  // HTML elements that can be used with class="incremental"
  // note that you can also put the class on containers like
  // up, ol, dl, and div to make their contents appear
  // incrementally. Upper case is used since this is what
  // browsers report for HTML node names (text/html).
  incremental_elements: null,
  okay_for_incremental: function (name) {
    if (!this.incremental_elements)
    {
      var inclist = new Array();
      inclist["p"] = true;
      inclist["pre"] = true;
      inclist["li"] = true;
      inclist["blockquote"] = true;
      inclist["dt"] = true;
      inclist["dd"] = true;
      inclist["h2"] = true;
      inclist["h3"] = true;
      inclist["h4"] = true;
      inclist["h5"] = true;
      inclist["h6"] = true;
      inclist["span"] = true;
      inclist["address"] = true;
      inclist["table"] = true;
      inclist["tr"] = true;
      inclist["th"] = true;
      inclist["td"] = true;
      inclist["img"] = true;
      inclist["object"] = true;
      this.incremental_elements = inclist;
    }
    return this.incremental_elements[name.toLowerCase()];
  },

  next_incremental_item: function (node) {
    var br = this.is_xhtml ? "br" : "BR";
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];

    for (;;)
    {
      node = w3c_slidy.next_node(slide, node);

      if (node == null || node.parentNode == null)
        break;

      if (node.nodeType == 1)  // ELEMENT
      {
        if (node.nodeName == br)
          continue;

        if (w3c_slidy.has_class(node, "incremental")
             && w3c_slidy.okay_for_incremental(node.nodeName))
          return node;

        if (w3c_slidy.has_class(node.parentNode, "incremental")
             && !w3c_slidy.has_class(node, "non-incremental"))
          return node;
      }
    }

    return node;
  },

  previous_incremental_item: function (node) {
    var br = this.is_xhtml ? "br" : "BR";
    var slide = w3c_slidy.slides[w3c_slidy.slide_number];

    for (;;)
    {
      node = w3c_slidy.previous_node(slide, node);

      if (node == null || node.parentNode == null)
        break;

      if (node.nodeType == 1)
      {
        if (node.nodeName == br)
          continue;

        if (w3c_slidy.has_class(node, "incremental")
             && w3c_slidy.okay_for_incremental(node.nodeName))
          return node;

        if (w3c_slidy.has_class(node.parentNode, "incremental")
             && !w3c_slidy.has_class(node, "non-incremental"))
          return node;
      }
    }

    return node;
  },

  // set visibility for all elements on current slide with
  // a parent element with attribute class="incremental"
  set_visibility_all_incremental: function (value) {
    var node = this.next_incremental_item(null);

    if (value == "hidden")
    {
      while (node)
      {
        w3c_slidy.add_class(node, "invisible");
        node = w3c_slidy.next_incremental_item(node);
      }
    }
    else // value == "visible"
    {
      while (node)
      {
        w3c_slidy.remove_class(node, "invisible");
        node = w3c_slidy.next_incremental_item(node);
      }
    }
  },

  // reveal the next hidden item on the slide
  // node is null or the node that was last revealed
  reveal_next_item: function (node) {
    node = w3c_slidy.next_incremental_item(node);

    if (node && node.nodeType == 1)  // an element
      w3c_slidy.remove_class(node, "invisible");

    return node;
  },

  // exact inverse of revealNextItem(node)
  hide_previous_item: function (node) {
    if (node && node.nodeType == 1)  // an element
      w3c_slidy.add_class(node, "invisible");

    return this.previous_incremental_item(node);
  },

  // left to right traversal of root's content
  next_node: function (root, node) {
    if (node == null)
      return root.firstChild;

    if (node.firstChild)
      return node.firstChild;

    if (node.nextSibling)
      return node.nextSibling;

    for (;;)
    {
      node = node.parentNode;

      if (!node || node == root)
        break;

      if (node && node.nextSibling)
        return node.nextSibling;
    }

    return null;
  },

  // right to left traversal of root's content
  previous_node: function (root, node) {
    if (node == null)
    {
      node = root.lastChild;

      if (node)
      {
        while (node.lastChild)
          node = node.lastChild;
      }

      return node;
    }

    if (node.previousSibling)
    {
      node = node.previousSibling;

      while (node.lastChild)
        node = node.lastChild;

      return node;
    }

    if (node.parentNode != root)
      return node.parentNode;

    return null;
  },

  previous_sibling_element: function (el) {
    el = el.previousSibling;

    while (el && el.nodeType != 1)
      el = el.previousSibling;

    return el;
  },

  next_sibling_element: function (el) {
    el = el.nextSibling;

    while (el && el.nodeType != 1)
      el = el.nextSibling;

    return el;
  },

  first_child_element: function (el) {
    var node;

    for (node = el.firstChild; node; node = node.nextSibling)
    {
      if (node.nodeType == 1)
        break;
    }

    return node;
  },

  first_tag: function (element, tag) {
    var node;

    if (!this.is_xhtml)
      tag = tag.toUpperCase();

    for (node = element.firstChild; node; node = node.nextSibling)
    {
      if (node.nodeType == 1 && node.nodeName == tag)
        break;
    }

    return node;
  },

  hide_selection: function () {
    if (window.getSelection) // Firefox, Chromium, Safari, Opera
    {
      var selection = window.getSelection();

      if (selection.rangeCount > 0)
      {
        var range = selection.getRangeAt(0);
        range.collapse (false);
      }
    }
    else // Internet Explorer
    {
      var textRange = document.selection.createRange ();
      textRange.collapse (false);
    }
  },

  get_selected_text: function () {
    try
    {
      if (window.getSelection)
        return window.getSelection().toString();

      if (document.getSelection)
        return document.getSelection().toString();

      if (document.selection)
        return document.selection.createRange().text;
    }
    catch (e)
    {
    }

    return "";
  },

  // make note of length of selected text
  // as this evaluates to zero in click event
  mouse_button_up: function (e) {
    w3c_slidy.selected_text_len = w3c_slidy.get_selected_text().length;
  },

  // right mouse button click is reserved for context menus
  // it is more reliable to detect rightclick than leftclick
  mouse_button_click: function (e) {
    var rightclick = false;
    var leftclick = false;
    var middleclick = false;
    var target;

    if (!e)
      var e = window.event;

    if (e.target)
      target = e.target;
    else if (e.srcElement)
      target = e.srcElement;

    // work around Safari bug
    if (target.nodeType == 3)
      target = target.parentNode;

    if (e.which) // all browsers except IE
    {
      leftclick = (e.which == 1);
      middleclick = (e.which == 2);
      rightclick = (e.which == 3);
    }
    else if (e.button)
    {
      // Konqueror gives 1 for left, 4 for middle
      // IE6 gives 0 for left and not 1 as I expected

      if (e.button == 4)
        middleclick = true;

      // all browsers agree on 2 for right button
      rightclick = (e.button == 2);
    }
    else leftclick = true;
/*
    alert("you clicked over a " + target.nodeName + " element\n" +
    "w3c_slidy.mouse_click_enabled = " + w3c_slidy.mouse_click_enabled + "\n" +
    "leftclick = " + leftclick + "\n" +
    "selected text length = " + w3c_slidy.selected_text_len);
    //alert("selected text length = " + w3c_slidy.selected_text_len);
*/
    if (w3c_slidy.selected_text_len > 0)
    {
      w3c_slidy.stop_propagation(e);
      e.cancel = true;
      e.returnValue = false;
      return false;
    }

    // dismiss table of contents
    w3c_slidy.hide_table_of_contents();

    // check if target is something that probably want's clicks
    // e.g. a, embed, object, input, textarea, select, option
    var tag = target.nodeName.toLowerCase();

    if (w3c_slidy.mouse_click_enabled && leftclick &&
        tag != "a" &&
        tag != "embed" &&
        tag != "object" &&
        tag != "video" &&
        tag != "input" &&
        tag != "textarea" &&
        tag != "select" &&
        tag != "option" &&
        !target.onclick)
    {
      w3c_slidy.next_slide(true);
      w3c_slidy.stop_propagation(e);
      e.cancel = true;
      e.returnValue = false;
      return false;
    }
  },

  get_key: function (e)
  {
    var key;

    // kludge around NS/IE differences
    if (typeof window.event != "undefined")
      key = window.event.keyCode;
    else if (e.which)
      key = e.which;

    return key;
  },

  get_target: function (e) {
    var target;

    if (!e)
      e = window.event;

    if (e.target)
      target = e.target;
    else if (e.srcElement)
      target = e.srcElement;

    if (target.nodeType != 1)
      target = target.parentNode;

    return target;
  },

  // does display property provide correct defaults?
  is_block: function (elem) {
    var tag = elem.nodeName.toLowerCase();

    return tag == "ol" || tag == "ul" || tag == "p" ||
           tag == "li" || tag == "table" || tag == "pre" ||
           tag == "h1" || tag == "h2" || tag == "h3" ||
           tag == "h4" || tag == "h5" || tag == "h6" ||
           tag == "blockquote" || tag == "address";
  },

  add_listener: function (element, event, handler) {
    if (window.addEventListener)
      element.addEventListener(event, handler, false);
    else
      element.attachEvent("on"+event, handler);
  },

  // used to prevent event propagation from field controls
  stop_propagation: function (event) {
    event = event ? event : window.event;
    event.cancelBubble = true;  // for IE

    if (event.stopPropagation)
      event.stopPropagation();

    return true;
  },

  cancel: function (event) {
    if (event)
    {
       event.cancel = true;
       event.returnValue = false;

      if (event.preventDefault)
        event.preventDefault();
    }

    w3c_slidy.key_wanted = false;
    return false;
  }
};

// for each language define an associative array
// and also the help text which is longer

var w3c_slidy_i18n = {
  strings_es: {
    "slide":"pág.",
    "help?":"Ayuda",
    "contents?":"Índice",
    "table of contents":"tabla de contenidos",
    "Table of Contents":"Tabla de Contenidos",
    "restart presentation":"Reiniciar presentación",
    "restart?":"Inicio"
  },
  help_es:
    "Utilice el ratón, barra espaciadora, teclas Izda/Dcha, " +
    "o Re pág y Av pág. Use S y B para cambiar el tamaño de fuente.",

  strings_ca: {
    "slide":"pàg..",
    "help?":"Ajuda",
    "contents?":"Índex",
    "table of contents":"taula de continguts",
    "Table of Contents":"Taula de Continguts",
    "restart presentation":"Reiniciar presentació",
    "restart?":"Inici"
  },
  help_ca:
    "Utilitzi el ratolí, barra espaiadora, tecles Esq./Dta. " +
    "o Re pàg y Av pàg. Usi S i B per canviar grandària de font.",

  strings_cs: {
    "slide":"snímek",
    "help?":"nápověda",
    "contents?":"obsah",
    "table of contents":"obsah prezentace",
    "Table of Contents":"Obsah prezentace",
    "restart presentation":"znovu spustit prezentaci",
    "restart?":"restart"
  },
  help_cs:
    "Prezentaci můžete procházet pomocí kliknutí myši, mezerníku, " +
    "šipek vlevo a vpravo nebo kláves PageUp a PageDown. Písmo se " +
    "dá zvětšit a zmenšit pomocí kláves B a S.",

  strings_nl: {
    "slide":"pagina",
    "help?":"Help?",
    "contents?":"Inhoud?",
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    "restart presentation":"herstart presentatie",
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  },
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  },
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    "restart?":"Début"
  },
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    "Table of Contents":"Tartalomjegyzék",
    "restart presentation":"bemutató újraindítása",
    "restart?":"újraindítás"
  },
  help_hu:
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    "restart?":"Inizio"
  },
  help_it:
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  strings_el: {
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    "help?":"βοήθεια;",
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    "Table of Contents":"Πίνακας Περιεχομένων",
    "restart presentation":"επανεκκίνηση παρουσίασης",
    "restart?":"επανεκκίνηση;"
  },
  help_el:
    "Πλοηγηθείτε με το κλίκ του ποντικιού, το space, τα βέλη αριστερά/δεξιά, " +
    "ή Page Up και Page Down. Χρησιμοποιήστε τα πλήκτρα S και B για να αλλάξετε " +
    "το μέγεθος της γραμματοσειράς.",

  strings_ja: {
    "slide":"スライド",
    "help?":"ヘルプ",
    "contents?":"目次",
    "table of contents":"目次を表示",
    "Table of Contents":"目次",
    "restart presentation":"最初から再生",
    "restart?":"最初から"
  },
  help_ja:
     "マウス左クリック ・ スペース ・ 左右キー " +
     "または Page Up ・ Page Downで操作, S ・ Bでフォントサイズ変更",

  strings_zh: {
    "slide":"幻灯片",
    "help?":"帮助?",
    "contents?":"内容?",
    "table of contents":"目录",
    "Table of Contents":"目录",
    "restart presentation":"重新启动展示",
    "restart?":"重新启动?"
  },
  help_zh:
    "用鼠标点击, 空格条, 左右箭头, Pg Up 和 Pg Dn 导航. " +
    "用 S, B 改变字体大小.",

  strings_ru: {
    "slide":"слайд",
    "help?":"помощь?",
    "contents?":"содержание?",
    "table of contents":"оглавление",
    "Table of Contents":"Оглавление",
    "restart presentation":"перезапустить презентацию",
    "restart?":"перезапуск?"
  },
  help_ru:
    "Перемещайтесь кликая мышкой, используя клавишу пробел, стрелки" +
    "влево/вправо или Pg Up и Pg Dn. Клавиши S и B меняют размер шрифта.",

  strings_sv: {
    "slide":"sida",
    "help?":"hjälp",
    "contents?":"innehåll",
    "table of contents":"innehållsförteckning",
    "Table of Contents":"Innehållsförteckning",
    "restart presentation":"visa presentationen från början",
    "restart?":"börja om"
  },
  help_sv:
    "Bläddra med ett klick med vänstra musknappen, mellanslagstangenten, " +
    "vänster- och högerpiltangenterna eller tangenterna Pg Up, Pg Dn. " +
    "Använd tangenterna S och B för att ändra textens storlek.",

// each such language array is declared in the localize array
// which is set on string prototype and used as in "foo".localize();
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    "es":this.strings_es,
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    "ru":this.strings_ru,
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</head>
<body class="article" style="max-width:45em">
<div id="header" class="slide">
<h1>Python Serialization</h1>
<span id="author">Miki Tebeka &lt;miki.tebeka@demandmedia.com&gt;</span><br />
</div>
<div class="sect1 slide">
<h1 id="_what">What?</h1>
<div class="sectionbody" style="max-width:45em">
<div class="paragraph"><p>Python has many ways to serialize data to disk (and other storage).
We&#8217;re going to cover many of them.</p></div>
<div class="paragraph"><p>Many of the serialization modules implement the same API:</p></div>
<ul class="">
<li>
<span>
<code>dump(object, stream)</code> - dump to stream
</span>
</li>
<li>
<span>
<code>load(stream)</code> - load from stream
</span>
</li>
<li>
<span>
<code>dumps(object)</code> - dump to string
</span>
</li>
<li>
<span>
<code>loads(str)</code> - load from string
</span>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_marshal">marshal</h1>
<div class="sectionbody" style="max-width:45em">
<ul class="">
<li>
<span>
<a href="http://docs.python.org/2/library/marshal.html">marshal</a> can serialize
    "basic" types (e.g. Can&#8217;t handle user defined classes).
</span>
</li>
<li>
<span>
The format is machine independent (dump on x86, load in ARM).
</span>
</li>
<li>
<span>
Format can change between Python versions
</span>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
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 7
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10
11
12
13
14
15
16</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">marshal</span>

<span class="n">data</span> <span class="o">=</span> <span class="p">{</span>
    <span class="s">&#39;name&#39;</span><span class="p">:</span> <span class="s">&#39;Daffy&#39;</span><span class="p">,</span>
    <span class="s">&#39;type&#39;</span><span class="p">:</span> <span class="s">&#39;Duck&#39;</span><span class="p">,</span>
    <span class="s">&#39;age&#39;</span><span class="p">:</span> <span class="mi">76</span><span class="p">,</span>
<span class="p">}</span>

<span class="n">tmp</span> <span class="o">=</span> <span class="s">&#39;/tmp/looney.m&#39;</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">,</span> <span class="s">&#39;wb&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">out</span><span class="p">:</span>  <span class="c"># <img alt="1" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>
    <span class="n">marshal</span><span class="o">.</span><span class="n">dump</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">out</span><span class="p">)</span>

<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">)</span> <span class="k">as</span> <span class="n">fo</span><span class="p">:</span>
    <span class="n">data1</span> <span class="o">=</span> <span class="n">marshal</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">fo</span><span class="p">)</span>

<span class="k">assert</span> <span class="n">data1</span> <span class="o">==</span> <span class="n">data</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
<div class="colist arabic"><table>
<tr><td><img alt="1" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
Always good idea to open in binary mode
</td></tr>
</table></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_pickle">pickle</h1>
<div class="sectionbody" style="max-width:45em">
<ul class="">
<li>
<span>
<a href="http://docs.python.org/2/library/pickle.html">pickle</a> can serialize
    almost anything.
</span>
</li>
<li>
<span>
The format is machine independent (dump on x86, load in ARM).
</span>
</li>
<li>
<span>
Python version compatible
</span>
<ul class="">
<li>
<span>
You can specify <code>protocol</code> for faster load/store (-1 = latest)
</span>
</li>
</ul>
</li>
<li>
<span>
cPickle is faster but a bit more restricted
</span>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_2">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">pickle</span>

<span class="k">class</span> <span class="nc">Point</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>  <span class="c"># <img alt="1" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>
    <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">y</span> <span class="o">=</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span>

<span class="n">p1</span><span class="p">,</span> <span class="n">p2</span> <span class="o">=</span> <span class="n">Point</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">),</span> <span class="n">Point</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>

<span class="n">tmp</span> <span class="o">=</span> <span class="s">&#39;/tmp/points.p&#39;</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">,</span> <span class="s">&#39;wb&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">out</span><span class="p">:</span>
    <span class="n">pickle</span><span class="o">.</span><span class="n">dump</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">out</span><span class="p">)</span>
    <span class="n">pickle</span><span class="o">.</span><span class="n">dump</span><span class="p">(</span><span class="n">p2</span><span class="p">,</span> <span class="n">out</span><span class="p">)</span>

<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">)</span> <span class="k">as</span> <span class="n">fo</span><span class="p">:</span>
    <span class="n">p1a</span><span class="p">,</span> <span class="n">p2a</span> <span class="o">=</span> <span class="n">pickle</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">fo</span><span class="p">),</span> <span class="n">pickle</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">fo</span><span class="p">)</span>  <span class="c"># <img alt="2" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABvSURBVAgd
BcGhAcJADADAky8rsZXIyK7AGkgksiu8RNYyAiswAhIbiYwMd7rrsS3LdlS3zuC8EtkqrJ/8vRdR
Js+PtSZTMHe+L8IAUXeGAZd8DYbArB3C5FbXiBNThSMzcxelM4DI1l0zxtge1f0HVNk1YLFij6sA
AABDdEVYdFNvZnR3YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlz
dGljLmVzLmR1cG9udC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUAODBlYWU1MjljOTRhN2Y0N2Rl
Y2NmYWRhMjhhY2I5ZGblb7ENAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>

<span class="k">assert</span> <span class="n">p2a</span><span class="o">.</span><span class="n">y</span> <span class="o">==</span> <span class="n">p2</span><span class="o">.</span><span class="n">y</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
<div class="colist arabic"><table>
<tr><td><img alt="1" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
User defined type
</td></tr>
<tr><td><img alt="2" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABvSURBVAgd
BcGhAcJADADAky8rsZXIyK7AGkgksiu8RNYyAiswAhIbiYwMd7rrsS3LdlS3zuC8EtkqrJ/8vRdR
Js+PtSZTMHe+L8IAUXeGAZd8DYbArB3C5FbXiBNThSMzcxelM4DI1l0zxtge1f0HVNk1YLFij6sA
AABDdEVYdFNvZnR3YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlz
dGljLmVzLmR1cG9udC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUAODBlYWU1MjljOTRhN2Y0N2Rl
Y2NmYWRhMjhhY2I5ZGblb7ENAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
Load several objects from stream
</td></tr>
</table></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_shelve">shelve</h1>
<div class="sectionbody" style="max-width:45em">
<ul class="">
<li>
<span>
<a href="http://docs.python.org/2/library/shelve.html">shelve</a> simple dictionary
  like database
</span>
</li>
<li>
<span>
Uses <code>pickle</code> and <code>bsddb</code> under the hood
</span>
</li>
<li>
<span>
Looks like a dictionary
</span>
<ul class="">
<li>
<span>
Only string keys though
</span>
</li>
</ul>
</li>
<li>
<span>
Note the
  <a href="http://docs.python.org/2/library/shelve.html#shelve.open">writeback</a> flag
</span>
<ul class="">
<li>
<span>
Otherwise manually <code>sync</code>
</span>
</li>
</ul>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_3">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">shelve</span>
<span class="kn">from</span> <span class="nn">pickle_example</span> <span class="kn">import</span> <span class="n">p1</span><span class="p">,</span> <span class="n">p2</span>

<span class="n">db</span> <span class="o">=</span> <span class="n">shelve</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="s">&#39;/tmp/looney.shelve&#39;</span><span class="p">)</span>  <span class="c"># <img alt="1" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>
<span class="n">db</span><span class="p">[</span><span class="s">&#39;p1&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">p1</span>
<span class="n">db</span><span class="p">[</span><span class="s">&#39;p2&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">p2</span>
<span class="n">db</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>

<span class="n">db</span> <span class="o">=</span> <span class="n">shelve</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="s">&#39;/tmp/looney.shelve&#39;</span><span class="p">)</span>
<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">db</span><span class="o">.</span><span class="n">keys</span><span class="p">())</span> <span class="o">==</span> <span class="mi">2</span><span class="p">,</span> <span class="s">&#39;missing data&#39;</span>
<span class="k">assert</span> <span class="n">db</span><span class="p">[</span><span class="s">&#39;p2&#39;</span><span class="p">]</span><span class="o">.</span><span class="n">x</span> <span class="o">==</span> <span class="n">p2</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
<div class="colist arabic"><table>
<tr><td><img alt="1" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
Will create first time
</td></tr>
</table></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_json">json</h1>
<div class="sectionbody" style="max-width:45em">
<ul class="">
<li>
<span>
<a href="http://docs.python.org/2/library/json.html">json</a> can serialize
    basic types
</span>
<ul class="">
<li>
<span>
You can register specific type handlers though (<code>object_hook</code>)
</span>
</li>
</ul>
</li>
<li>
<span>
Not all Python types can be mapped to JSON (sets &#8230;)
</span>
</li>
<li>
<span>
Pretty fast (written in C)
</span>
</li>
<li>
<span>
Can serialize only one object
</span>
<ul class="">
<li>
<span>
Though you can use
    <a href="http://docs.python.org/2/library/json.html#json.JSONDecoder.raw_decode">JSONDecoder.raw_decode</a>
</span>
</li>
</ul>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_4">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">json</span>

<span class="n">data</span> <span class="o">=</span> <span class="p">{</span>
    <span class="s">&#39;name&#39;</span><span class="p">:</span> <span class="s">&#39;Daffy&#39;</span><span class="p">,</span>
    <span class="s">&#39;type&#39;</span><span class="p">:</span> <span class="s">&#39;Duck&#39;</span><span class="p">,</span>
    <span class="s">&#39;age&#39;</span><span class="p">:</span> <span class="mi">76</span><span class="p">,</span>
<span class="p">}</span>

<span class="n">tmp</span> <span class="o">=</span> <span class="s">&#39;/tmp/looney.json&#39;</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">,</span> <span class="s">&#39;wb&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">out</span><span class="p">:</span>
    <span class="n">json</span><span class="o">.</span><span class="n">dump</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">out</span><span class="p">)</span>

<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">)</span> <span class="k">as</span> <span class="n">fo</span><span class="p">:</span>
    <span class="n">data1</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">fo</span><span class="p">)</span>

<span class="k">assert</span> <span class="n">data1</span> <span class="o">==</span> <span class="n">data</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_yaml">yaml</h1>
<div class="sectionbody" style="max-width:45em">
<ul class="">
<li>
<span>
<a href="http://pyyaml.org/wiki/PyYAMLDocumentation">yaml</a> can serialize almost anything
</span>
<ul class="">
<li>
<span>
Not in the standard library
</span>
</li>
<li>
<span>
Object hooks via YAML tags
</span>
</li>
<li>
<span>
YAML is a superset of JSON
</span>
</li>
</ul>
</li>
<li>
<span>
Not all Python types can be mapped to YAML (sets &#8230;)
</span>
</li>
<li>
<span>
Dog slow compared to JSON
</span>
<ul class="">
<li>
<span>
However YAML is much more readable (IMO)
</span>
</li>
</ul>
</li>
<li>
<span>
Can serialized several objects
</span>
<ul class="">
<li>
<span>
Use <code>load_all</code>
</span>
</li>
</ul>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_5">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">yaml</span><span class="o">,</span> <span class="nn">datetime</span>

<span class="n">data</span> <span class="o">=</span> <span class="p">{</span>
    <span class="s">&#39;name&#39;</span><span class="p">:</span> <span class="s">&#39;Daffy&#39;</span><span class="p">,</span>
    <span class="s">&#39;type&#39;</span><span class="p">:</span> <span class="s">&#39;Duck&#39;</span><span class="p">,</span>
    <span class="s">&#39;born&#39;</span><span class="p">:</span> <span class="n">datetime</span><span class="o">.</span><span class="n">date</span><span class="p">(</span><span class="mi">1937</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">17</span><span class="p">),</span>  <span class="c"># <img alt="1" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>
<span class="p">}</span>

<span class="n">tmp</span> <span class="o">=</span> <span class="s">&#39;/tmp/looney.yaml&#39;</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">,</span> <span class="s">&#39;wb&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">out</span><span class="p">:</span>
    <span class="n">yaml</span><span class="o">.</span><span class="n">dump</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">out</span><span class="p">,</span> <span class="n">default_flow_style</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>  <span class="c"># <img alt="2" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABvSURBVAgd
BcGhAcJADADAky8rsZXIyK7AGkgksiu8RNYyAiswAhIbiYwMd7rrsS3LdlS3zuC8EtkqrJ/8vRdR
Js+PtSZTMHe+L8IAUXeGAZd8DYbArB3C5FbXiBNThSMzcxelM4DI1l0zxtge1f0HVNk1YLFij6sA
AABDdEVYdFNvZnR3YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlz
dGljLmVzLmR1cG9udC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUAODBlYWU1MjljOTRhN2Y0N2Rl
Y2NmYWRhMjhhY2I5ZGblb7ENAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>

<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">)</span> <span class="k">as</span> <span class="n">fo</span><span class="p">:</span>
    <span class="n">data1</span> <span class="o">=</span> <span class="n">yaml</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">fo</span><span class="p">)</span>

<span class="k">assert</span> <span class="n">data1</span> <span class="o">==</span> <span class="n">data</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
<div class="colist arabic"><table>
<tr><td><img alt="1" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
Supports <code>datetime</code> OOTB
</td></tr>
<tr><td><img alt="2" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABvSURBVAgd
BcGhAcJADADAky8rsZXIyK7AGkgksiu8RNYyAiswAhIbiYwMd7rrsS3LdlS3zuC8EtkqrJ/8vRdR
Js+PtSZTMHe+L8IAUXeGAZd8DYbArB3C5FbXiBNThSMzcxelM4DI1l0zxtge1f0HVNk1YLFij6sA
AABDdEVYdFNvZnR3YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlz
dGljLmVzLmR1cG9udC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUAODBlYWU1MjljOTRhN2Y0N2Rl
Y2NmYWRhMjhhY2I5ZGblb7ENAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
Pretty YAML
</td></tr>
</table></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_python">Python</h1>
<div class="sectionbody" style="max-width:45em">
<div class="paragraph"><p>You can use Python files as configuration. Mostly for reading (you can probably
write, but it&#8217;s harder).</p></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_config_py">config.py</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1</pre></div></td><td class="code"><div class="highlight"><pre><span class="n">points</span> <span class="o">=</span> <span class="p">[{</span><span class="s">&#39;x&#39;</span><span class="p">:</span> <span class="n">x</span><span class="p">,</span> <span class="s">&#39;y&#39;</span><span class="p">:</span> <span class="n">x</span><span class="o">+</span><span class="mi">1</span><span class="p">}</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)]</span>
</pre></div>
</td></tr></table></div></div>
<ul class="">
<li>
<span>
You have all the power of Python (environment, reading files &#8230;)
</span>
</li>
<li>
<span>
Try to limit yourself to native types
</span>
</li>
<li>
<span>
You can "pass down" functions, parameters &#8230; (via
  <a href="http://docs.python.org/2/library/functions.html#execfile">execfile</a>
  <code>globals</code>)
</span>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_6">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
2
3
4
5
6
7</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">config</span>

<span class="k">assert</span> <span class="n">config</span><span class="o">.</span><span class="n">points</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="p">{</span><span class="s">&#39;x&#39;</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="s">&#39;y&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">}</span>

<span class="n">cfg</span> <span class="o">=</span> <span class="p">{}</span>
<span class="nb">execfile</span><span class="p">(</span><span class="s">&#39;src/config.py&#39;</span><span class="p">,</span> <span class="p">{},</span> <span class="n">cfg</span><span class="p">)</span>  <span class="c"># <img alt="1" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>
<span class="k">assert</span> <span class="n">cfg</span><span class="p">[</span><span class="s">&#39;points&#39;</span><span class="p">]</span> <span class="o">==</span> <span class="n">config</span><span class="o">.</span><span class="n">points</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
<div class="colist arabic"><table>
<tr><td><img alt="1" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
<code>execfile</code> is gone in Python 3
</td></tr>
</table></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_csv">csv</h1>
<div class="sectionbody" style="max-width:45em">
<ul class="">
<li>
<span>
<a href="http://docs.python.org/2/library/csv.html">csv</a> read and write CSV files
</span>
<ul class="">
<li>
<span>
Support different dialects, quoting, delimiters &#8230;
</span>
</li>
</ul>
</li>
<li>
<span>
Avoid CSVs at all cost
</span>
<ul class="">
<li>
<span>
Horrible quoting problems
</span>
</li>
<li>
<span>
No built in schema (see
<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.io.parsers.read_csv.html">pandas.read_csv</a> if you need that
</span>
</li>
</ul>
</li>
<li>
<span>
Has both <code>reader</code> which return lines and <code>DictReader</code> which return dicts
</span>
</li>
<li>
<span>
Same for <code>writer</code> and <code>DictWriter</code>
</span>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_7">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">csv</span>
<span class="n">tmp</span> <span class="o">=</span> <span class="s">&#39;/tmp/points.csv&#39;</span>
<span class="n">points</span> <span class="o">=</span> <span class="p">[{</span><span class="s">&#39;x&#39;</span><span class="p">:</span> <span class="n">x</span><span class="p">,</span> <span class="s">&#39;y&#39;</span><span class="p">:</span> <span class="n">x</span><span class="o">+</span><span class="mi">1</span><span class="p">}</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)]</span>

<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">,</span> <span class="s">&#39;w&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">out</span><span class="p">:</span>
    <span class="n">writer</span> <span class="o">=</span> <span class="n">csv</span><span class="o">.</span><span class="n">DictWriter</span><span class="p">(</span><span class="n">out</span><span class="p">,</span> <span class="p">[</span><span class="s">&#39;x&#39;</span><span class="p">,</span> <span class="s">&#39;y&#39;</span><span class="p">])</span>
    <span class="n">writer</span><span class="o">.</span><span class="n">writeheader</span><span class="p">()</span>
    <span class="n">writer</span><span class="o">.</span><span class="n">writerows</span><span class="p">(</span><span class="n">points</span><span class="p">)</span>

<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">)</span> <span class="k">as</span> <span class="n">fo</span><span class="p">:</span>
    <span class="n">reader</span> <span class="o">=</span> <span class="n">csv</span><span class="o">.</span><span class="n">DictReader</span><span class="p">(</span><span class="n">fo</span><span class="p">)</span>
    <span class="n">points1</span> <span class="o">=</span> <span class="p">[</span><span class="n">point</span> <span class="k">for</span> <span class="n">point</span> <span class="ow">in</span> <span class="n">reader</span><span class="p">]</span>  <span class="c"># Values are strings</span>

<span class="k">def</span> <span class="nf">apply_schema</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="n">schema</span><span class="p">):</span>
    <span class="k">return</span> <span class="nb">dict</span><span class="p">((</span><span class="n">key</span><span class="p">,</span> <span class="n">schema</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="k">lambda</span> <span class="n">x</span><span class="p">:</span> <span class="n">x</span><span class="p">)(</span><span class="n">value</span><span class="p">))</span>
                <span class="k">for</span> <span class="n">key</span><span class="p">,</span> <span class="n">value</span> <span class="ow">in</span> <span class="n">obj</span><span class="o">.</span><span class="n">iteritems</span><span class="p">())</span>

<span class="n">points2</span> <span class="o">=</span> <span class="p">[</span><span class="n">apply_schema</span><span class="p">(</span><span class="n">point</span><span class="p">,</span> <span class="p">{</span><span class="s">&#39;x&#39;</span><span class="p">:</span> <span class="nb">int</span><span class="p">,</span> <span class="s">&#39;y&#39;</span><span class="p">:</span> <span class="nb">int</span><span class="p">})</span> <span class="k">for</span> <span class="n">point</span> <span class="ow">in</span> <span class="n">points1</span><span class="p">]</span>
<span class="k">assert</span> <span class="n">points2</span> <span class="o">==</span> <span class="n">points</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_ini_files">ini files</h1>
<div class="sectionbody" style="max-width:45em">
<ul class="">
<li>
<span>
<a href="http://docs.python.org/2/library/configparser.html">ConfigParser</a> read and
  write <code>.ini</code> files
</span>
</li>
<li>
<span>
Two levels: section &gt; option
</span>
</li>
<li>
<span>
Can read several files
</span>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_8">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">ConfigParser</span> <span class="kn">import</span> <span class="n">ConfigParser</span>

<span class="n">cfg</span> <span class="o">=</span> <span class="n">ConfigParser</span><span class="p">()</span>
<span class="n">section</span><span class="p">,</span> <span class="n">age</span> <span class="o">=</span> <span class="s">&#39;daffy&#39;</span><span class="p">,</span> <span class="mi">76</span>
<span class="n">cfg</span><span class="o">.</span><span class="n">add_section</span><span class="p">(</span><span class="n">section</span><span class="p">)</span>
<span class="n">cfg</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">section</span><span class="p">,</span> <span class="s">&#39;type&#39;</span><span class="p">,</span> <span class="s">&#39;duck&#39;</span><span class="p">)</span>
<span class="n">cfg</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">section</span><span class="p">,</span> <span class="s">&#39;age&#39;</span><span class="p">,</span> <span class="n">age</span><span class="p">)</span>

<span class="n">tmp</span> <span class="o">=</span> <span class="s">&#39;/tmp/looney.ini&#39;</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">,</span> <span class="s">&#39;w&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">out</span><span class="p">:</span>
    <span class="n">cfg</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">out</span><span class="p">)</span>

<span class="n">cfg</span> <span class="o">=</span> <span class="n">ConfigParser</span><span class="p">()</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">)</span> <span class="k">as</span> <span class="n">fo</span><span class="p">:</span>
    <span class="n">cfg</span><span class="o">.</span><span class="n">readfp</span><span class="p">(</span><span class="n">fo</span><span class="p">)</span>

<span class="k">assert</span> <span class="n">cfg</span><span class="o">.</span><span class="n">getint</span><span class="p">(</span><span class="n">section</span><span class="p">,</span> <span class="s">&#39;age&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="n">age</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>  <span class="c"># <img alt="1" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>
</pre></div>
</td></tr></table></div></div>
<div class="colist arabic"><table>
<tr><td><img alt="1" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
Explicit cast
</td></tr>
</table></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_sqlite">SQLite</h1>
<div class="sectionbody" style="max-width:45em">
<ul class="">
<li>
<span>
<a href="http://docs.python.org/2/library/sqlite3.html">sqlite3</a> is full featured
  embedded SQL library
</span>
<ul class="">
<li>
<span>
Installed everywhere (comes with Firefox, Chrome &#8230;)
</span>
</li>
</ul>
</li>
<li>
<span>
Not all Python types can be mapped to SQLite types
</span>
<ul class="">
<li>
<span>
However you can use
<a href="http://docs.python.org/2/library/sqlite3.html#using-adapters-to-store-additional-python-types-in-sqlite-databases">adapters</a>
</span>
</li>
</ul>
</li>
<li>
<span>
As many other database libraries, implements
  <a href="http://www.python.org/dev/peps/pep-0249/">dbapi 2</a>
</span>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_9">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">sqlite3</span>

<span class="n">points</span> <span class="o">=</span> <span class="p">[(</span><span class="n">x</span><span class="p">,</span> <span class="n">x</span><span class="o">+</span><span class="mi">1</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)]</span>

<span class="n">db</span> <span class="o">=</span> <span class="n">sqlite3</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="s">&#39;:memory:&#39;</span><span class="p">)</span>  <span class="c"># <img alt="1" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>
<span class="n">cur</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">cursor</span><span class="p">()</span>
<span class="k">with</span> <span class="n">db</span><span class="p">:</span>  <span class="c"># <img alt="2" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABvSURBVAgd
BcGhAcJADADAky8rsZXIyK7AGkgksiu8RNYyAiswAhIbiYwMd7rrsS3LdlS3zuC8EtkqrJ/8vRdR
Js+PtSZTMHe+L8IAUXeGAZd8DYbArB3C5FbXiBNThSMzcxelM4DI1l0zxtge1f0HVNk1YLFij6sA
AABDdEVYdFNvZnR3YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlz
dGljLmVzLmR1cG9udC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUAODBlYWU1MjljOTRhN2Y0N2Rl
Y2NmYWRhMjhhY2I5ZGblb7ENAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>
    <span class="n">cur</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s">&#39;CREATE TABLE points (x INT, y INT)&#39;</span><span class="p">)</span>
    <span class="n">cur</span><span class="o">.</span><span class="n">executemany</span><span class="p">(</span><span class="s">&#39;INSERT INTO points (x, y) VALUES (?, ?)&#39;</span><span class="p">,</span> <span class="n">points</span><span class="p">)</span>

<span class="n">cur</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s">&#39;SELECT x, y FROM points ORDER BY x, y&#39;</span><span class="p">)</span>
<span class="n">points1</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="n">cur</span><span class="p">)</span>  <span class="c"># <img alt="3" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABxSURBVAgd
BcGhAYNAEEXBJ1duG8gvr5XYSGRaiFyJTAtI2kAisSeRK39msHsbmePXNp4ixgg0TYu8r/tM1BR8
ZqRXKAS5kF5BBMA+r4AgAMa7VwgEr4LzAFFQj8bzhaJF7t17oMZzgQA0jd2lSG1t/wFRuDVjQOMG
MAAAAEN0RVh0U29mdHdhcmUAQCgjKUltYWdlTWFnaWNrIDQuMi44IDk5LzA4LzAxIGNyaXN0eUBt
eXN0aWMuZXMuZHVwb250LmNvbZG6IbgAAAAqdEVYdFNpZ25hdHVyZQA4MGJiZGEyNzI2ZGRhY2U4
YWI4YTAxZjU5ZGUyZWJkYgj9DnUAAAAOdEVYdFBhZ2UAMTJ4MTIrMCswhG27fQAAAABJRU5ErkJg
gg==" /></span>

<span class="k">assert</span> <span class="n">points1</span> <span class="o">==</span> <span class="n">points</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
<div class="colist arabic"><table>
<tr><td><img alt="1" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
In memory database
</td></tr>
<tr><td><img alt="2" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABvSURBVAgd
BcGhAcJADADAky8rsZXIyK7AGkgksiu8RNYyAiswAhIbiYwMd7rrsS3LdlS3zuC8EtkqrJ/8vRdR
Js+PtSZTMHe+L8IAUXeGAZd8DYbArB3C5FbXiBNThSMzcxelM4DI1l0zxtge1f0HVNk1YLFij6sA
AABDdEVYdFNvZnR3YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlz
dGljLmVzLmR1cG9udC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUAODBlYWU1MjljOTRhN2Y0N2Rl
Y2NmYWRhMjhhY2I5ZGblb7ENAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
Will automatically commit or rollback
</td></tr>
<tr><td><img alt="3" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABxSURBVAgd
BcGhAYNAEEXBJ1duG8gvr5XYSGRaiFyJTAtI2kAisSeRK39msHsbmePXNp4ixgg0TYu8r/tM1BR8
ZqRXKAS5kF5BBMA+r4AgAMa7VwgEr4LzAFFQj8bzhaJF7t17oMZzgQA0jd2lSG1t/wFRuDVjQOMG
MAAAAEN0RVh0U29mdHdhcmUAQCgjKUltYWdlTWFnaWNrIDQuMi44IDk5LzA4LzAxIGNyaXN0eUBt
eXN0aWMuZXMuZHVwb250LmNvbZG6IbgAAAAqdEVYdFNpZ25hdHVyZQA4MGJiZGEyNzI2ZGRhY2U4
YWI4YTAxZjU5ZGUyZWJkYgj9DnUAAAAOdEVYdFBhZ2UAMTJ4MTIrMCswhG27fQAAAABJRU5ErkJg
gg==" /></td><td>
<code>cursor</code> objects are iterable
</td></tr>
</table></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_2_2">Example 2</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">sqlite3</span>

<span class="n">points</span> <span class="o">=</span> <span class="p">[{</span><span class="s">&#39;x&#39;</span><span class="p">:</span> <span class="n">x</span><span class="p">,</span> <span class="s">&#39;y&#39;</span><span class="p">:</span> <span class="n">x</span><span class="o">+</span><span class="mi">1</span><span class="p">}</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)]</span>  <span class="c"># <img alt="1" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>

<span class="n">db</span> <span class="o">=</span> <span class="n">sqlite3</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="s">&#39;:memory:&#39;</span><span class="p">)</span>
<span class="n">db</span><span class="o">.</span><span class="n">row_factory</span> <span class="o">=</span> <span class="n">sqlite3</span><span class="o">.</span><span class="n">Row</span>  <span class="c"># <img alt="2" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABvSURBVAgd
BcGhAcJADADAky8rsZXIyK7AGkgksiu8RNYyAiswAhIbiYwMd7rrsS3LdlS3zuC8EtkqrJ/8vRdR
Js+PtSZTMHe+L8IAUXeGAZd8DYbArB3C5FbXiBNThSMzcxelM4DI1l0zxtge1f0HVNk1YLFij6sA
AABDdEVYdFNvZnR3YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlz
dGljLmVzLmR1cG9udC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUAODBlYWU1MjljOTRhN2Y0N2Rl
Y2NmYWRhMjhhY2I5ZGblb7ENAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>
<span class="k">with</span> <span class="n">db</span><span class="p">:</span>
    <span class="n">cur</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">cursor</span><span class="p">()</span>
    <span class="n">cur</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s">&#39;CREATE TABLE points (x INT, y INT)&#39;</span><span class="p">)</span>
    <span class="n">cur</span><span class="o">.</span><span class="n">executemany</span><span class="p">(</span><span class="s">&#39;INSERT INTO points (x, y) VALUES (:x, :y)&#39;</span><span class="p">,</span> <span class="n">points</span><span class="p">)</span>  <span class="c"># <img alt="3" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABxSURBVAgd
BcGhAYNAEEXBJ1duG8gvr5XYSGRaiFyJTAtI2kAisSeRK39msHsbmePXNp4ixgg0TYu8r/tM1BR8
ZqRXKAS5kF5BBMA+r4AgAMa7VwgEr4LzAFFQj8bzhaJF7t17oMZzgQA0jd2lSG1t/wFRuDVjQOMG
MAAAAEN0RVh0U29mdHdhcmUAQCgjKUltYWdlTWFnaWNrIDQuMi44IDk5LzA4LzAxIGNyaXN0eUBt
eXN0aWMuZXMuZHVwb250LmNvbZG6IbgAAAAqdEVYdFNpZ25hdHVyZQA4MGJiZGEyNzI2ZGRhY2U4
YWI4YTAxZjU5ZGUyZWJkYgj9DnUAAAAOdEVYdFBhZ2UAMTJ4MTIrMCswhG27fQAAAABJRU5ErkJg
gg==" /></span>

<span class="n">cur</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s">&#39;SELECT x, y FROM points ORDER BY x, y&#39;</span><span class="p">)</span>
<span class="n">points1</span> <span class="o">=</span> <span class="p">[</span><span class="nb">dict</span><span class="p">(</span><span class="n">row</span><span class="p">)</span> <span class="k">for</span> <span class="n">row</span> <span class="ow">in</span> <span class="n">cur</span><span class="p">]</span>

<span class="k">assert</span> <span class="n">points1</span> <span class="o">==</span> <span class="n">points</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
<div class="colist arabic"><table>
<tr><td><img alt="1" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
Yummy dicts
</td></tr>
<tr><td><img alt="2" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABvSURBVAgd
BcGhAcJADADAky8rsZXIyK7AGkgksiu8RNYyAiswAhIbiYwMd7rrsS3LdlS3zuC8EtkqrJ/8vRdR
Js+PtSZTMHe+L8IAUXeGAZd8DYbArB3C5FbXiBNThSMzcxelM4DI1l0zxtge1f0HVNk1YLFij6sA
AABDdEVYdFNvZnR3YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlz
dGljLmVzLmR1cG9udC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUAODBlYWU1MjljOTRhN2Y0N2Rl
Y2NmYWRhMjhhY2I5ZGblb7ENAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
<a href="http://docs.python.org/2/library/sqlite3.html#row-objects">sqlite3.Row</a>
    behaves like a dict and a tuple
</td></tr>
<tr><td><img alt="3" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABxSURBVAgd
BcGhAYNAEEXBJ1duG8gvr5XYSGRaiFyJTAtI2kAisSeRK39msHsbmePXNp4ixgg0TYu8r/tM1BR8
ZqRXKAS5kF5BBMA+r4AgAMa7VwgEr4LzAFFQj8bzhaJF7t17oMZzgQA0jd2lSG1t/wFRuDVjQOMG
MAAAAEN0RVh0U29mdHdhcmUAQCgjKUltYWdlTWFnaWNrIDQuMi44IDk5LzA4LzAxIGNyaXN0eUBt
eXN0aWMuZXMuZHVwb250LmNvbZG6IbgAAAAqdEVYdFNpZ25hdHVyZQA4MGJiZGEyNzI2ZGRhY2U4
YWI4YTAxZjU5ZGUyZWJkYgj9DnUAAAAOdEVYdFBhZ2UAMTJ4MTIrMCswhG27fQAAAABJRU5ErkJg
gg==" /></td><td>
By name, not position
</td></tr>
</table></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_sqlalchemy">SQLAlchemy</h1>
<div class="sectionbody" style="max-width:45em">
<div class="paragraph"><p><a href="http://www.sqlalchemy.org/">SQLAlchemy</a> is an ORM mapper.
(There&#8217;s also <a href="http://www.sqlalchemy.org/">SQLObject</a>).</p></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_10">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="kn">import</span> <span class="n">create_engine</span><span class="p">,</span> <span class="n">Column</span><span class="p">,</span> <span class="n">Integer</span>
<span class="kn">from</span> <span class="nn">sqlalchemy.ext.declarative</span> <span class="kn">import</span> <span class="n">declarative_base</span>
<span class="kn">from</span> <span class="nn">sqlalchemy.orm</span> <span class="kn">import</span> <span class="n">sessionmaker</span>

<span class="n">engine</span> <span class="o">=</span> <span class="n">create_engine</span><span class="p">(</span><span class="s">&#39;sqlite:///:memory:&#39;</span><span class="p">)</span>
<span class="n">Base</span> <span class="o">=</span> <span class="n">declarative_base</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>

<span class="k">class</span> <span class="nc">Point</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
    <span class="n">__tablename__</span> <span class="o">=</span> <span class="s">&#39;points&#39;</span>

    <span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">primary_key</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
    <span class="n">x</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">)</span>
    <span class="n">y</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">y</span> <span class="o">=</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span>

<span class="n">Base</span><span class="o">.</span><span class="n">metadata</span><span class="o">.</span><span class="n">create_all</span><span class="p">()</span>
</pre></div>
</td></tr></table></div></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_cont">Example (cont.)</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
2
3
4
5
6
7
8</pre></div></td><td class="code"><div class="highlight"><pre><span class="n">Session</span> <span class="o">=</span> <span class="n">sessionmaker</span><span class="p">(</span><span class="n">bind</span><span class="o">=</span><span class="n">engine</span><span class="p">)</span>

<span class="n">session</span> <span class="o">=</span> <span class="n">Session</span><span class="p">()</span>
<span class="n">session</span><span class="o">.</span><span class="n">add_all</span><span class="p">([</span><span class="n">Point</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">),</span> <span class="n">Point</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">)])</span>
<span class="n">session</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span>

<span class="n">p1</span> <span class="o">=</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Point</span><span class="p">)</span><span class="o">.</span><span class="n">filter_by</span><span class="p">(</span><span class="n">x</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">first</span><span class="p">()</span>
<span class="k">assert</span> <span class="n">p1</span><span class="o">.</span><span class="n">y</span> <span class="o">==</span> <span class="mi">1</span><span class="p">,</span> <span class="s">&#39;corrupted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_xml">XML</h1>
<div class="sectionbody" style="max-width:45em">
<ul class="">
<li>
<span>
Python has many modules to handle XML
</span>
</li>
<li>
<span>
We&#8217;ll go over
  <a href="http://docs.python.org/2/library/xml.etree.elementtree.html">ElementTree</a>
</span>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_example_11">Example</h1>
<div class="sectionbody" style="max-width:45em">
<div class="listingblock">
<div class="content"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">xml.etree.ElementTree</span> <span class="kn">as</span> <span class="nn">et</span>

<span class="n">tmp</span> <span class="o">=</span> <span class="s">&#39;/tmp/points.xml&#39;</span>
<span class="n">points</span> <span class="o">=</span> <span class="p">[{</span><span class="s">&#39;x&#39;</span><span class="p">:</span> <span class="nb">str</span><span class="p">(</span><span class="n">x</span><span class="p">),</span> <span class="s">&#39;y&#39;</span><span class="p">:</span> <span class="nb">str</span><span class="p">(</span><span class="n">x</span><span class="o">+</span><span class="mi">1</span><span class="p">)}</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)]</span>  <span class="c"># <img alt="1" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>

<span class="n">root</span> <span class="o">=</span> <span class="n">et</span><span class="o">.</span><span class="n">Element</span><span class="p">(</span><span class="s">&#39;points&#39;</span><span class="p">)</span>
<span class="n">tree</span> <span class="o">=</span> <span class="n">et</span><span class="o">.</span><span class="n">ElementTree</span><span class="p">(</span><span class="n">root</span><span class="p">)</span>
<span class="k">for</span> <span class="n">point</span> <span class="ow">in</span> <span class="n">points</span><span class="p">:</span>
    <span class="n">root</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">et</span><span class="o">.</span><span class="n">Element</span><span class="p">(</span><span class="s">&#39;point&#39;</span><span class="p">,</span> <span class="n">point</span><span class="p">))</span>

<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">,</span> <span class="s">&#39;w&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">out</span><span class="p">:</span>
    <span class="n">tree</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">out</span><span class="p">)</span>

<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">tmp</span><span class="p">)</span> <span class="k">as</span> <span class="n">fo</span><span class="p">:</span>
    <span class="n">tree</span> <span class="o">=</span> <span class="n">et</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">fo</span><span class="p">)</span>

<span class="n">epoints</span> <span class="o">=</span> <span class="n">tree</span><span class="o">.</span><span class="n">iterfind</span><span class="p">(</span><span class="s">&#39;.//point&#39;</span><span class="p">)</span>  <span class="c"># <img alt="2" src="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABvSURBVAgd
BcGhAcJADADAky8rsZXIyK7AGkgksiu8RNYyAiswAhIbiYwMd7rrsS3LdlS3zuC8EtkqrJ/8vRdR
Js+PtSZTMHe+L8IAUXeGAZd8DYbArB3C5FbXiBNThSMzcxelM4DI1l0zxtge1f0HVNk1YLFij6sA
AABDdEVYdFNvZnR3YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlz
dGljLmVzLmR1cG9udC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUAODBlYWU1MjljOTRhN2Y0N2Rl
Y2NmYWRhMjhhY2I5ZGblb7ENAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></span>
<span class="n">points1</span> <span class="o">=</span> <span class="p">[</span><span class="nb">dict</span><span class="p">(</span><span class="n">ep</span><span class="o">.</span><span class="n">items</span><span class="p">())</span> <span class="k">for</span> <span class="n">ep</span> <span class="ow">in</span> <span class="n">epoints</span><span class="p">]</span>
<span class="k">assert</span> <span class="n">points1</span> <span class="o">==</span> <span class="n">points</span><span class="p">,</span> <span class="s">&#39;corrpted data&#39;</span>
</pre></div>
</td></tr></table></div></div>
<div class="colist arabic"><table>
<tr><td><img alt="1" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABjSURBVHja
VY6xDcAwCAS/pPQaLim9QmajdOk2I2SNrMEIlARIoigU8Cek/4e7zdHaWOYOVwaoA6wOCw05Y7FB
gE0tIWQ+sBcwKM8qoD/wB5wGL8hjfdzWrh01GRp1hInGjDoXwHgsFuzBVLQAAABDdEVYdFNvZnR3
YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlzdGljLmVzLmR1cG9u
dC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUANThhMDcyZTA3MGRhMjJmNjEzNWNiZDNlNDE0NTQ2
ZjloaiHtAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
Values must be strings
</td></tr>
<tr><td><img alt="2" src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAAAAABzHgM7AAAAAmJLR0QAAKqNIzIAAABvSURBVAgd
BcGhAcJADADAky8rsZXIyK7AGkgksiu8RNYyAiswAhIbiYwMd7rrsS3LdlS3zuC8EtkqrJ/8vRdR
Js+PtSZTMHe+L8IAUXeGAZd8DYbArB3C5FbXiBNThSMzcxelM4DI1l0zxtge1f0HVNk1YLFij6sA
AABDdEVYdFNvZnR3YXJlAEAoIylJbWFnZU1hZ2ljayA0LjIuOCA5OS8wOC8wMSBjcmlzdHlAbXlz
dGljLmVzLmR1cG9udC5jb22RuiG4AAAAKnRFWHRTaWduYXR1cmUAODBlYWU1MjljOTRhN2Y0N2Rl
Y2NmYWRhMjhhY2I5ZGblb7ENAAAADnRFWHRQYWdlADEyeDEyKzArMIRtu30AAAAASUVORK5CYII=" /></td><td>
xpath support
</td></tr>
</table></div>
</div>
</div>
<div class="sect1 slide">
<h1 id="_honorable_mentions">Honorable Mentions</h1>
<div class="sectionbody" style="max-width:45em">
<ul class="">
<li>
<span>
<a href="http://docs.python.org/2/library/stringio.html">StringIO</a> - Great for
  debugging
</span>
</li>
<li>
<span>
<a href="http://docs.python.org/2/library/bsddb.html">bsddb</a> - Super fast database
</span>
</li>
<li>
<span>
<a href="http://avro.apache.org/docs/current/gettingstartedpython.html">Avro</a> - Did
  anyone said "Hadoop"?
</span>
<ul class="">
<li>
<span>
There&#8217;s also <a href="https://bitbucket.org/tebeka/fastavro">faster</a> version :)
</span>
</li>
</ul>
</li>
<li>
<span>
<a href="https://developers.google.com/protocol-buffers/docs/pythontutorial">Protocol
  Buffers</a>, and <a href="http://thrift.apache.org">Thrift</a>
</span>
</li>
<li>
<span>
<a href="https://github.com/msgpack/msgpack-python">msgpack</a> - Claims to be fast
</span>
</li>
<li>
<span>
<a href="https://github.com/mongodb/mongo-python-driver">bson</a> - Fast as well
</span>
</li>
<li>
<span>
<a href="http://docs.python.org/2/library/struct.html">sturct</a> and
  <a href="http://docs.python.org/2/library/array.html">array</a> if you decide to write
  your own binary format
</span>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_a_word_of_caution">A Word Of Caution</h1>
<div class="sectionbody" style="max-width:45em">
<div class="paragraph"><p>Many of these modules are vulnerable to code injection (they use some form of
<code>eval</code>).</p></div>
<div class="paragraph"><p>If you don&#8217;t know where the data is coming from - try to use the <code>safe</code>
functions/objects of the serialization module (if provided).</p></div>
<ul class="">
<li>
<span>
<code>yaml.safe_load</code>
</span>
</li>
<li>
<span>
<code>SafeConfigParser</code>
</span>
</li>
</ul>
</div>
</div>
<div class="sect1 slide">
<h1 id="_thank_you">Thank You</h1>
<div class="sectionbody" style="max-width:45em">
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</span></p></div>
<div class="paragraph"><p>This presentation was made with
<a href="http://www.methods.co.nz/asciidoc/">asciidoc</a> using the
<a href="http://www.w3.org/Talks/Tools/Slidy2/Overview.html">slidy</a> backend and
<a href="http://pygments.org/">Pygments</a> syntax highlighter.</p></div>
</div>
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