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Anonymous committed 8f3a530

Issue #14874: Restore charmap decoding speed to pre-PEP 393 levels.
Patch by Serhiy Storchaka.

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  • Parent commits 73df491

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Files changed (11)

File Lib/codecs.py

         mapped to themselves.
 
     """
-    res = {}
-    for i in rng:
-        res[i]=i
-    return res
+    return {i:i for i in rng}
 
 def make_encoding_map(decoding_map):
 

File Lib/encodings/cp037.py

     '\xd9'     #  0xFD -> LATIN CAPITAL LETTER U WITH GRAVE
     '\xda'     #  0xFE -> LATIN CAPITAL LETTER U WITH ACUTE
     '\x9f'     #  0xFF -> CONTROL
+    '\ufffe'   ## Widen to UCS2 for optimization
 )
 
 ### Encoding table

File Lib/encodings/cp500.py

     '\xd9'     #  0xFD -> LATIN CAPITAL LETTER U WITH GRAVE
     '\xda'     #  0xFE -> LATIN CAPITAL LETTER U WITH ACUTE
     '\x9f'     #  0xFF -> CONTROL
+    '\ufffe'   ## Widen to UCS2 for optimization
 )
 
 ### Encoding table

File Lib/encodings/hp_roman8.py

 class Codec(codecs.Codec):
 
     def encode(self,input,errors='strict'):
-        return codecs.charmap_encode(input,errors,encoding_map)
+        return codecs.charmap_encode(input,errors,encoding_table)
 
     def decode(self,input,errors='strict'):
-        return codecs.charmap_decode(input,errors,decoding_map)
+        return codecs.charmap_decode(input,errors,decoding_table)
 
 class IncrementalEncoder(codecs.IncrementalEncoder):
     def encode(self, input, final=False):
-        return codecs.charmap_encode(input,self.errors,encoding_map)[0]
+        return codecs.charmap_encode(input,self.errors,encoding_table)[0]
 
 class IncrementalDecoder(codecs.IncrementalDecoder):
     def decode(self, input, final=False):
-        return codecs.charmap_decode(input,self.errors,decoding_map)[0]
+        return codecs.charmap_decode(input,self.errors,decoding_table)[0]
 
 class StreamWriter(Codec,codecs.StreamWriter):
     pass
         streamreader=StreamReader,
     )
 
-### Decoding Map
 
-decoding_map = codecs.make_identity_dict(range(256))
-decoding_map.update({
-        0x00a1: 0x00c0, #       LATIN CAPITAL LETTER A WITH GRAVE
-        0x00a2: 0x00c2, #       LATIN CAPITAL LETTER A WITH CIRCUMFLEX
-        0x00a3: 0x00c8, #       LATIN CAPITAL LETTER E WITH GRAVE
-        0x00a4: 0x00ca, #       LATIN CAPITAL LETTER E WITH CIRCUMFLEX
-        0x00a5: 0x00cb, #       LATIN CAPITAL LETTER E WITH DIAERESIS
-        0x00a6: 0x00ce, #       LATIN CAPITAL LETTER I WITH CIRCUMFLEX
-        0x00a7: 0x00cf, #       LATIN CAPITAL LETTER I WITH DIAERESIS
-        0x00a8: 0x00b4, #       ACUTE ACCENT
-        0x00a9: 0x02cb, #       MODIFIER LETTER GRAVE ACCENT (Mandarin Chinese fourth tone)
-        0x00aa: 0x02c6, #       MODIFIER LETTER CIRCUMFLEX ACCENT
-        0x00ab: 0x00a8, #       DIAERESIS
-        0x00ac: 0x02dc, #       SMALL TILDE
-        0x00ad: 0x00d9, #       LATIN CAPITAL LETTER U WITH GRAVE
-        0x00ae: 0x00db, #       LATIN CAPITAL LETTER U WITH CIRCUMFLEX
-        0x00af: 0x20a4, #       LIRA SIGN
-        0x00b0: 0x00af, #       MACRON
-        0x00b1: 0x00dd, #       LATIN CAPITAL LETTER Y WITH ACUTE
-        0x00b2: 0x00fd, #       LATIN SMALL LETTER Y WITH ACUTE
-        0x00b3: 0x00b0, #       DEGREE SIGN
-        0x00b4: 0x00c7, #       LATIN CAPITAL LETTER C WITH CEDILLA
-        0x00b5: 0x00e7, #       LATIN SMALL LETTER C WITH CEDILLA
-        0x00b6: 0x00d1, #       LATIN CAPITAL LETTER N WITH TILDE
-        0x00b7: 0x00f1, #       LATIN SMALL LETTER N WITH TILDE
-        0x00b8: 0x00a1, #       INVERTED EXCLAMATION MARK
-        0x00b9: 0x00bf, #       INVERTED QUESTION MARK
-        0x00ba: 0x00a4, #       CURRENCY SIGN
-        0x00bb: 0x00a3, #       POUND SIGN
-        0x00bc: 0x00a5, #       YEN SIGN
-        0x00bd: 0x00a7, #       SECTION SIGN
-        0x00be: 0x0192, #       LATIN SMALL LETTER F WITH HOOK
-        0x00bf: 0x00a2, #       CENT SIGN
-        0x00c0: 0x00e2, #       LATIN SMALL LETTER A WITH CIRCUMFLEX
-        0x00c1: 0x00ea, #       LATIN SMALL LETTER E WITH CIRCUMFLEX
-        0x00c2: 0x00f4, #       LATIN SMALL LETTER O WITH CIRCUMFLEX
-        0x00c3: 0x00fb, #       LATIN SMALL LETTER U WITH CIRCUMFLEX
-        0x00c4: 0x00e1, #       LATIN SMALL LETTER A WITH ACUTE
-        0x00c5: 0x00e9, #       LATIN SMALL LETTER E WITH ACUTE
-        0x00c6: 0x00f3, #       LATIN SMALL LETTER O WITH ACUTE
-        0x00c7: 0x00fa, #       LATIN SMALL LETTER U WITH ACUTE
-        0x00c8: 0x00e0, #       LATIN SMALL LETTER A WITH GRAVE
-        0x00c9: 0x00e8, #       LATIN SMALL LETTER E WITH GRAVE
-        0x00ca: 0x00f2, #       LATIN SMALL LETTER O WITH GRAVE
-        0x00cb: 0x00f9, #       LATIN SMALL LETTER U WITH GRAVE
-        0x00cc: 0x00e4, #       LATIN SMALL LETTER A WITH DIAERESIS
-        0x00cd: 0x00eb, #       LATIN SMALL LETTER E WITH DIAERESIS
-        0x00ce: 0x00f6, #       LATIN SMALL LETTER O WITH DIAERESIS
-        0x00cf: 0x00fc, #       LATIN SMALL LETTER U WITH DIAERESIS
-        0x00d0: 0x00c5, #       LATIN CAPITAL LETTER A WITH RING ABOVE
-        0x00d1: 0x00ee, #       LATIN SMALL LETTER I WITH CIRCUMFLEX
-        0x00d2: 0x00d8, #       LATIN CAPITAL LETTER O WITH STROKE
-        0x00d3: 0x00c6, #       LATIN CAPITAL LETTER AE
-        0x00d4: 0x00e5, #       LATIN SMALL LETTER A WITH RING ABOVE
-        0x00d5: 0x00ed, #       LATIN SMALL LETTER I WITH ACUTE
-        0x00d6: 0x00f8, #       LATIN SMALL LETTER O WITH STROKE
-        0x00d7: 0x00e6, #       LATIN SMALL LETTER AE
-        0x00d8: 0x00c4, #       LATIN CAPITAL LETTER A WITH DIAERESIS
-        0x00d9: 0x00ec, #       LATIN SMALL LETTER I WITH GRAVE
-        0x00da: 0x00d6, #       LATIN CAPITAL LETTER O WITH DIAERESIS
-        0x00db: 0x00dc, #       LATIN CAPITAL LETTER U WITH DIAERESIS
-        0x00dc: 0x00c9, #       LATIN CAPITAL LETTER E WITH ACUTE
-        0x00dd: 0x00ef, #       LATIN SMALL LETTER I WITH DIAERESIS
-        0x00de: 0x00df, #       LATIN SMALL LETTER SHARP S (German)
-        0x00df: 0x00d4, #       LATIN CAPITAL LETTER O WITH CIRCUMFLEX
-        0x00e0: 0x00c1, #       LATIN CAPITAL LETTER A WITH ACUTE
-        0x00e1: 0x00c3, #       LATIN CAPITAL LETTER A WITH TILDE
-        0x00e2: 0x00e3, #       LATIN SMALL LETTER A WITH TILDE
-        0x00e3: 0x00d0, #       LATIN CAPITAL LETTER ETH (Icelandic)
-        0x00e4: 0x00f0, #       LATIN SMALL LETTER ETH (Icelandic)
-        0x00e5: 0x00cd, #       LATIN CAPITAL LETTER I WITH ACUTE
-        0x00e6: 0x00cc, #       LATIN CAPITAL LETTER I WITH GRAVE
-        0x00e7: 0x00d3, #       LATIN CAPITAL LETTER O WITH ACUTE
-        0x00e8: 0x00d2, #       LATIN CAPITAL LETTER O WITH GRAVE
-        0x00e9: 0x00d5, #       LATIN CAPITAL LETTER O WITH TILDE
-        0x00ea: 0x00f5, #       LATIN SMALL LETTER O WITH TILDE
-        0x00eb: 0x0160, #       LATIN CAPITAL LETTER S WITH CARON
-        0x00ec: 0x0161, #       LATIN SMALL LETTER S WITH CARON
-        0x00ed: 0x00da, #       LATIN CAPITAL LETTER U WITH ACUTE
-        0x00ee: 0x0178, #       LATIN CAPITAL LETTER Y WITH DIAERESIS
-        0x00ef: 0x00ff, #       LATIN SMALL LETTER Y WITH DIAERESIS
-        0x00f0: 0x00de, #       LATIN CAPITAL LETTER THORN (Icelandic)
-        0x00f1: 0x00fe, #       LATIN SMALL LETTER THORN (Icelandic)
-        0x00f2: 0x00b7, #       MIDDLE DOT
-        0x00f3: 0x00b5, #       MICRO SIGN
-        0x00f4: 0x00b6, #       PILCROW SIGN
-        0x00f5: 0x00be, #       VULGAR FRACTION THREE QUARTERS
-        0x00f6: 0x2014, #       EM DASH
-        0x00f7: 0x00bc, #       VULGAR FRACTION ONE QUARTER
-        0x00f8: 0x00bd, #       VULGAR FRACTION ONE HALF
-        0x00f9: 0x00aa, #       FEMININE ORDINAL INDICATOR
-        0x00fa: 0x00ba, #       MASCULINE ORDINAL INDICATOR
-        0x00fb: 0x00ab, #       LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
-        0x00fc: 0x25a0, #       BLACK SQUARE
-        0x00fd: 0x00bb, #       RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
-        0x00fe: 0x00b1, #       PLUS-MINUS SIGN
-        0x00ff: None,
-})
+### Decoding Table
 
-### Encoding Map
+decoding_table = (
+    '\x00'     #  0x00 -> NULL
+    '\x01'     #  0x01 -> START OF HEADING
+    '\x02'     #  0x02 -> START OF TEXT
+    '\x03'     #  0x03 -> END OF TEXT
+    '\x04'     #  0x04 -> END OF TRANSMISSION
+    '\x05'     #  0x05 -> ENQUIRY
+    '\x06'     #  0x06 -> ACKNOWLEDGE
+    '\x07'     #  0x07 -> BELL
+    '\x08'     #  0x08 -> BACKSPACE
+    '\t'       #  0x09 -> HORIZONTAL TABULATION
+    '\n'       #  0x0A -> LINE FEED
+    '\x0b'     #  0x0B -> VERTICAL TABULATION
+    '\x0c'     #  0x0C -> FORM FEED
+    '\r'       #  0x0D -> CARRIAGE RETURN
+    '\x0e'     #  0x0E -> SHIFT OUT
+    '\x0f'     #  0x0F -> SHIFT IN
+    '\x10'     #  0x10 -> DATA LINK ESCAPE
+    '\x11'     #  0x11 -> DEVICE CONTROL ONE
+    '\x12'     #  0x12 -> DEVICE CONTROL TWO
+    '\x13'     #  0x13 -> DEVICE CONTROL THREE
+    '\x14'     #  0x14 -> DEVICE CONTROL FOUR
+    '\x15'     #  0x15 -> NEGATIVE ACKNOWLEDGE
+    '\x16'     #  0x16 -> SYNCHRONOUS IDLE
+    '\x17'     #  0x17 -> END OF TRANSMISSION BLOCK
+    '\x18'     #  0x18 -> CANCEL
+    '\x19'     #  0x19 -> END OF MEDIUM
+    '\x1a'     #  0x1A -> SUBSTITUTE
+    '\x1b'     #  0x1B -> ESCAPE
+    '\x1c'     #  0x1C -> FILE SEPARATOR
+    '\x1d'     #  0x1D -> GROUP SEPARATOR
+    '\x1e'     #  0x1E -> RECORD SEPARATOR
+    '\x1f'     #  0x1F -> UNIT SEPARATOR
+    ' '        #  0x20 -> SPACE
+    '!'        #  0x21 -> EXCLAMATION MARK
+    '"'        #  0x22 -> QUOTATION MARK
+    '#'        #  0x23 -> NUMBER SIGN
+    '$'        #  0x24 -> DOLLAR SIGN
+    '%'        #  0x25 -> PERCENT SIGN
+    '&'        #  0x26 -> AMPERSAND
+    "'"        #  0x27 -> APOSTROPHE
+    '('        #  0x28 -> LEFT PARENTHESIS
+    ')'        #  0x29 -> RIGHT PARENTHESIS
+    '*'        #  0x2A -> ASTERISK
+    '+'        #  0x2B -> PLUS SIGN
+    ','        #  0x2C -> COMMA
+    '-'        #  0x2D -> HYPHEN-MINUS
+    '.'        #  0x2E -> FULL STOP
+    '/'        #  0x2F -> SOLIDUS
+    '0'        #  0x30 -> DIGIT ZERO
+    '1'        #  0x31 -> DIGIT ONE
+    '2'        #  0x32 -> DIGIT TWO
+    '3'        #  0x33 -> DIGIT THREE
+    '4'        #  0x34 -> DIGIT FOUR
+    '5'        #  0x35 -> DIGIT FIVE
+    '6'        #  0x36 -> DIGIT SIX
+    '7'        #  0x37 -> DIGIT SEVEN
+    '8'        #  0x38 -> DIGIT EIGHT
+    '9'        #  0x39 -> DIGIT NINE
+    ':'        #  0x3A -> COLON
+    ';'        #  0x3B -> SEMICOLON
+    '<'        #  0x3C -> LESS-THAN SIGN
+    '='        #  0x3D -> EQUALS SIGN
+    '>'        #  0x3E -> GREATER-THAN SIGN
+    '?'        #  0x3F -> QUESTION MARK
+    '@'        #  0x40 -> COMMERCIAL AT
+    'A'        #  0x41 -> LATIN CAPITAL LETTER A
+    'B'        #  0x42 -> LATIN CAPITAL LETTER B
+    'C'        #  0x43 -> LATIN CAPITAL LETTER C
+    'D'        #  0x44 -> LATIN CAPITAL LETTER D
+    'E'        #  0x45 -> LATIN CAPITAL LETTER E
+    'F'        #  0x46 -> LATIN CAPITAL LETTER F
+    'G'        #  0x47 -> LATIN CAPITAL LETTER G
+    'H'        #  0x48 -> LATIN CAPITAL LETTER H
+    'I'        #  0x49 -> LATIN CAPITAL LETTER I
+    'J'        #  0x4A -> LATIN CAPITAL LETTER J
+    'K'        #  0x4B -> LATIN CAPITAL LETTER K
+    'L'        #  0x4C -> LATIN CAPITAL LETTER L
+    'M'        #  0x4D -> LATIN CAPITAL LETTER M
+    'N'        #  0x4E -> LATIN CAPITAL LETTER N
+    'O'        #  0x4F -> LATIN CAPITAL LETTER O
+    'P'        #  0x50 -> LATIN CAPITAL LETTER P
+    'Q'        #  0x51 -> LATIN CAPITAL LETTER Q
+    'R'        #  0x52 -> LATIN CAPITAL LETTER R
+    'S'        #  0x53 -> LATIN CAPITAL LETTER S
+    'T'        #  0x54 -> LATIN CAPITAL LETTER T
+    'U'        #  0x55 -> LATIN CAPITAL LETTER U
+    'V'        #  0x56 -> LATIN CAPITAL LETTER V
+    'W'        #  0x57 -> LATIN CAPITAL LETTER W
+    'X'        #  0x58 -> LATIN CAPITAL LETTER X
+    'Y'        #  0x59 -> LATIN CAPITAL LETTER Y
+    'Z'        #  0x5A -> LATIN CAPITAL LETTER Z
+    '['        #  0x5B -> LEFT SQUARE BRACKET
+    '\\'       #  0x5C -> REVERSE SOLIDUS
+    ']'        #  0x5D -> RIGHT SQUARE BRACKET
+    '^'        #  0x5E -> CIRCUMFLEX ACCENT
+    '_'        #  0x5F -> LOW LINE
+    '`'        #  0x60 -> GRAVE ACCENT
+    'a'        #  0x61 -> LATIN SMALL LETTER A
+    'b'        #  0x62 -> LATIN SMALL LETTER B
+    'c'        #  0x63 -> LATIN SMALL LETTER C
+    'd'        #  0x64 -> LATIN SMALL LETTER D
+    'e'        #  0x65 -> LATIN SMALL LETTER E
+    'f'        #  0x66 -> LATIN SMALL LETTER F
+    'g'        #  0x67 -> LATIN SMALL LETTER G
+    'h'        #  0x68 -> LATIN SMALL LETTER H
+    'i'        #  0x69 -> LATIN SMALL LETTER I
+    'j'        #  0x6A -> LATIN SMALL LETTER J
+    'k'        #  0x6B -> LATIN SMALL LETTER K
+    'l'        #  0x6C -> LATIN SMALL LETTER L
+    'm'        #  0x6D -> LATIN SMALL LETTER M
+    'n'        #  0x6E -> LATIN SMALL LETTER N
+    'o'        #  0x6F -> LATIN SMALL LETTER O
+    'p'        #  0x70 -> LATIN SMALL LETTER P
+    'q'        #  0x71 -> LATIN SMALL LETTER Q
+    'r'        #  0x72 -> LATIN SMALL LETTER R
+    's'        #  0x73 -> LATIN SMALL LETTER S
+    't'        #  0x74 -> LATIN SMALL LETTER T
+    'u'        #  0x75 -> LATIN SMALL LETTER U
+    'v'        #  0x76 -> LATIN SMALL LETTER V
+    'w'        #  0x77 -> LATIN SMALL LETTER W
+    'x'        #  0x78 -> LATIN SMALL LETTER X
+    'y'        #  0x79 -> LATIN SMALL LETTER Y
+    'z'        #  0x7A -> LATIN SMALL LETTER Z
+    '{'        #  0x7B -> LEFT CURLY BRACKET
+    '|'        #  0x7C -> VERTICAL LINE
+    '}'        #  0x7D -> RIGHT CURLY BRACKET
+    '~'        #  0x7E -> TILDE
+    '\x7f'     #  0x7F -> DELETE
+    '\x80'     #  0x80 -> <control>
+    '\x81'     #  0x81 -> <control>
+    '\x82'     #  0x82 -> <control>
+    '\x83'     #  0x83 -> <control>
+    '\x84'     #  0x84 -> <control>
+    '\x85'     #  0x85 -> <control>
+    '\x86'     #  0x86 -> <control>
+    '\x87'     #  0x87 -> <control>
+    '\x88'     #  0x88 -> <control>
+    '\x89'     #  0x89 -> <control>
+    '\x8a'     #  0x8A -> <control>
+    '\x8b'     #  0x8B -> <control>
+    '\x8c'     #  0x8C -> <control>
+    '\x8d'     #  0x8D -> <control>
+    '\x8e'     #  0x8E -> <control>
+    '\x8f'     #  0x8F -> <control>
+    '\x90'     #  0x90 -> <control>
+    '\x91'     #  0x91 -> <control>
+    '\x92'     #  0x92 -> <control>
+    '\x93'     #  0x93 -> <control>
+    '\x94'     #  0x94 -> <control>
+    '\x95'     #  0x95 -> <control>
+    '\x96'     #  0x96 -> <control>
+    '\x97'     #  0x97 -> <control>
+    '\x98'     #  0x98 -> <control>
+    '\x99'     #  0x99 -> <control>
+    '\x9a'     #  0x9A -> <control>
+    '\x9b'     #  0x9B -> <control>
+    '\x9c'     #  0x9C -> <control>
+    '\x9d'     #  0x9D -> <control>
+    '\x9e'     #  0x9E -> <control>
+    '\x9f'     #  0x9F -> <control>
+    '\xa0'     #  0xA0 -> NO-BREAK SPACE
+    '\xc0'     #  0xA1 -> LATIN CAPITAL LETTER A WITH GRAVE
+    '\xc2'     #  0xA2 -> LATIN CAPITAL LETTER A WITH CIRCUMFLEX
+    '\xc8'     #  0xA3 -> LATIN CAPITAL LETTER E WITH GRAVE
+    '\xca'     #  0xA4 -> LATIN CAPITAL LETTER E WITH CIRCUMFLEX
+    '\xcb'     #  0xA5 -> LATIN CAPITAL LETTER E WITH DIAERESIS
+    '\xce'     #  0xA6 -> LATIN CAPITAL LETTER I WITH CIRCUMFLEX
+    '\xcf'     #  0xA7 -> LATIN CAPITAL LETTER I WITH DIAERESIS
+    '\xb4'     #  0xA8 -> ACUTE ACCENT
+    '\u02cb'   #  0xA9 -> MODIFIER LETTER GRAVE ACCENT (MANDARIN CHINESE FOURTH TONE)
+    '\u02c6'   #  0xAA -> MODIFIER LETTER CIRCUMFLEX ACCENT
+    '\xa8'     #  0xAB -> DIAERESIS
+    '\u02dc'   #  0xAC -> SMALL TILDE
+    '\xd9'     #  0xAD -> LATIN CAPITAL LETTER U WITH GRAVE
+    '\xdb'     #  0xAE -> LATIN CAPITAL LETTER U WITH CIRCUMFLEX
+    '\u20a4'   #  0xAF -> LIRA SIGN
+    '\xaf'     #  0xB0 -> MACRON
+    '\xdd'     #  0xB1 -> LATIN CAPITAL LETTER Y WITH ACUTE
+    '\xfd'     #  0xB2 -> LATIN SMALL LETTER Y WITH ACUTE
+    '\xb0'     #  0xB3 -> DEGREE SIGN
+    '\xc7'     #  0xB4 -> LATIN CAPITAL LETTER C WITH CEDILLA
+    '\xe7'     #  0xB5 -> LATIN SMALL LETTER C WITH CEDILLA
+    '\xd1'     #  0xB6 -> LATIN CAPITAL LETTER N WITH TILDE
+    '\xf1'     #  0xB7 -> LATIN SMALL LETTER N WITH TILDE
+    '\xa1'     #  0xB8 -> INVERTED EXCLAMATION MARK
+    '\xbf'     #  0xB9 -> INVERTED QUESTION MARK
+    '\xa4'     #  0xBA -> CURRENCY SIGN
+    '\xa3'     #  0xBB -> POUND SIGN
+    '\xa5'     #  0xBC -> YEN SIGN
+    '\xa7'     #  0xBD -> SECTION SIGN
+    '\u0192'   #  0xBE -> LATIN SMALL LETTER F WITH HOOK
+    '\xa2'     #  0xBF -> CENT SIGN
+    '\xe2'     #  0xC0 -> LATIN SMALL LETTER A WITH CIRCUMFLEX
+    '\xea'     #  0xC1 -> LATIN SMALL LETTER E WITH CIRCUMFLEX
+    '\xf4'     #  0xC2 -> LATIN SMALL LETTER O WITH CIRCUMFLEX
+    '\xfb'     #  0xC3 -> LATIN SMALL LETTER U WITH CIRCUMFLEX
+    '\xe1'     #  0xC4 -> LATIN SMALL LETTER A WITH ACUTE
+    '\xe9'     #  0xC5 -> LATIN SMALL LETTER E WITH ACUTE
+    '\xf3'     #  0xC6 -> LATIN SMALL LETTER O WITH ACUTE
+    '\xfa'     #  0xC7 -> LATIN SMALL LETTER U WITH ACUTE
+    '\xe0'     #  0xC8 -> LATIN SMALL LETTER A WITH GRAVE
+    '\xe8'     #  0xC9 -> LATIN SMALL LETTER E WITH GRAVE
+    '\xf2'     #  0xCA -> LATIN SMALL LETTER O WITH GRAVE
+    '\xf9'     #  0xCB -> LATIN SMALL LETTER U WITH GRAVE
+    '\xe4'     #  0xCC -> LATIN SMALL LETTER A WITH DIAERESIS
+    '\xeb'     #  0xCD -> LATIN SMALL LETTER E WITH DIAERESIS
+    '\xf6'     #  0xCE -> LATIN SMALL LETTER O WITH DIAERESIS
+    '\xfc'     #  0xCF -> LATIN SMALL LETTER U WITH DIAERESIS
+    '\xc5'     #  0xD0 -> LATIN CAPITAL LETTER A WITH RING ABOVE
+    '\xee'     #  0xD1 -> LATIN SMALL LETTER I WITH CIRCUMFLEX
+    '\xd8'     #  0xD2 -> LATIN CAPITAL LETTER O WITH STROKE
+    '\xc6'     #  0xD3 -> LATIN CAPITAL LETTER AE
+    '\xe5'     #  0xD4 -> LATIN SMALL LETTER A WITH RING ABOVE
+    '\xed'     #  0xD5 -> LATIN SMALL LETTER I WITH ACUTE
+    '\xf8'     #  0xD6 -> LATIN SMALL LETTER O WITH STROKE
+    '\xe6'     #  0xD7 -> LATIN SMALL LETTER AE
+    '\xc4'     #  0xD8 -> LATIN CAPITAL LETTER A WITH DIAERESIS
+    '\xec'     #  0xD9 -> LATIN SMALL LETTER I WITH GRAVE
+    '\xd6'     #  0xDA -> LATIN CAPITAL LETTER O WITH DIAERESIS
+    '\xdc'     #  0xDB -> LATIN CAPITAL LETTER U WITH DIAERESIS
+    '\xc9'     #  0xDC -> LATIN CAPITAL LETTER E WITH ACUTE
+    '\xef'     #  0xDD -> LATIN SMALL LETTER I WITH DIAERESIS
+    '\xdf'     #  0xDE -> LATIN SMALL LETTER SHARP S (GERMAN)
+    '\xd4'     #  0xDF -> LATIN CAPITAL LETTER O WITH CIRCUMFLEX
+    '\xc1'     #  0xE0 -> LATIN CAPITAL LETTER A WITH ACUTE
+    '\xc3'     #  0xE1 -> LATIN CAPITAL LETTER A WITH TILDE
+    '\xe3'     #  0xE2 -> LATIN SMALL LETTER A WITH TILDE
+    '\xd0'     #  0xE3 -> LATIN CAPITAL LETTER ETH (ICELANDIC)
+    '\xf0'     #  0xE4 -> LATIN SMALL LETTER ETH (ICELANDIC)
+    '\xcd'     #  0xE5 -> LATIN CAPITAL LETTER I WITH ACUTE
+    '\xcc'     #  0xE6 -> LATIN CAPITAL LETTER I WITH GRAVE
+    '\xd3'     #  0xE7 -> LATIN CAPITAL LETTER O WITH ACUTE
+    '\xd2'     #  0xE8 -> LATIN CAPITAL LETTER O WITH GRAVE
+    '\xd5'     #  0xE9 -> LATIN CAPITAL LETTER O WITH TILDE
+    '\xf5'     #  0xEA -> LATIN SMALL LETTER O WITH TILDE
+    '\u0160'   #  0xEB -> LATIN CAPITAL LETTER S WITH CARON
+    '\u0161'   #  0xEC -> LATIN SMALL LETTER S WITH CARON
+    '\xda'     #  0xED -> LATIN CAPITAL LETTER U WITH ACUTE
+    '\u0178'   #  0xEE -> LATIN CAPITAL LETTER Y WITH DIAERESIS
+    '\xff'     #  0xEF -> LATIN SMALL LETTER Y WITH DIAERESIS
+    '\xde'     #  0xF0 -> LATIN CAPITAL LETTER THORN (ICELANDIC)
+    '\xfe'     #  0xF1 -> LATIN SMALL LETTER THORN (ICELANDIC)
+    '\xb7'     #  0xF2 -> MIDDLE DOT
+    '\xb5'     #  0xF3 -> MICRO SIGN
+    '\xb6'     #  0xF4 -> PILCROW SIGN
+    '\xbe'     #  0xF5 -> VULGAR FRACTION THREE QUARTERS
+    '\u2014'   #  0xF6 -> EM DASH
+    '\xbc'     #  0xF7 -> VULGAR FRACTION ONE QUARTER
+    '\xbd'     #  0xF8 -> VULGAR FRACTION ONE HALF
+    '\xaa'     #  0xF9 -> FEMININE ORDINAL INDICATOR
+    '\xba'     #  0xFA -> MASCULINE ORDINAL INDICATOR
+    '\xab'     #  0xFB -> LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
+    '\u25a0'   #  0xFC -> BLACK SQUARE
+    '\xbb'     #  0xFD -> RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
+    '\xb1'     #  0xFE -> PLUS-MINUS SIGN
+    '\ufffe'
+)
 
-encoding_map = codecs.make_encoding_map(decoding_map)
+### Encoding table
+encoding_table=codecs.charmap_build(decoding_table)
+

File Lib/encodings/iso8859_1.py

     '\xfd'     #  0xFD -> LATIN SMALL LETTER Y WITH ACUTE
     '\xfe'     #  0xFE -> LATIN SMALL LETTER THORN (Icelandic)
     '\xff'     #  0xFF -> LATIN SMALL LETTER Y WITH DIAERESIS
+    '\ufffe'   ## Widen to UCS2 for optimization
 )
 
 ### Encoding table

File Lib/encodings/mac_latin2.py

-""" Python Character Mapping Codec generated from 'LATIN2.TXT' with gencodec.py.
+""" Python Character Mapping Codec mac_latin2 generated from 'MAPPINGS/VENDORS/MICSFT/MAC/LATIN2.TXT' with gencodec.py.
 
 Written by Marc-Andre Lemburg (mal@lemburg.com).
 
 class Codec(codecs.Codec):
 
     def encode(self,input,errors='strict'):
-        return codecs.charmap_encode(input,errors,encoding_map)
+        return codecs.charmap_encode(input,errors,encoding_table)
 
     def decode(self,input,errors='strict'):
-        return codecs.charmap_decode(input,errors,decoding_map)
+        return codecs.charmap_decode(input,errors,decoding_table)
 
 class IncrementalEncoder(codecs.IncrementalEncoder):
     def encode(self, input, final=False):
-        return codecs.charmap_encode(input,self.errors,encoding_map)[0]
+        return codecs.charmap_encode(input,self.errors,encoding_table)[0]
 
 class IncrementalDecoder(codecs.IncrementalDecoder):
     def decode(self, input, final=False):
-        return codecs.charmap_decode(input,self.errors,decoding_map)[0]
+        return codecs.charmap_decode(input,self.errors,decoding_table)[0]
 
 class StreamWriter(Codec,codecs.StreamWriter):
     pass
         streamwriter=StreamWriter,
     )
 
-### Decoding Map
 
-decoding_map = codecs.make_identity_dict(range(256))
-decoding_map.update({
-        0x0080: 0x00c4, # LATIN CAPITAL LETTER A WITH DIAERESIS
-        0x0081: 0x0100, # LATIN CAPITAL LETTER A WITH MACRON
-        0x0082: 0x0101, # LATIN SMALL LETTER A WITH MACRON
-        0x0083: 0x00c9, # LATIN CAPITAL LETTER E WITH ACUTE
-        0x0084: 0x0104, # LATIN CAPITAL LETTER A WITH OGONEK
-        0x0085: 0x00d6, # LATIN CAPITAL LETTER O WITH DIAERESIS
-        0x0086: 0x00dc, # LATIN CAPITAL LETTER U WITH DIAERESIS
-        0x0087: 0x00e1, # LATIN SMALL LETTER A WITH ACUTE
-        0x0088: 0x0105, # LATIN SMALL LETTER A WITH OGONEK
-        0x0089: 0x010c, # LATIN CAPITAL LETTER C WITH CARON
-        0x008a: 0x00e4, # LATIN SMALL LETTER A WITH DIAERESIS
-        0x008b: 0x010d, # LATIN SMALL LETTER C WITH CARON
-        0x008c: 0x0106, # LATIN CAPITAL LETTER C WITH ACUTE
-        0x008d: 0x0107, # LATIN SMALL LETTER C WITH ACUTE
-        0x008e: 0x00e9, # LATIN SMALL LETTER E WITH ACUTE
-        0x008f: 0x0179, # LATIN CAPITAL LETTER Z WITH ACUTE
-        0x0090: 0x017a, # LATIN SMALL LETTER Z WITH ACUTE
-        0x0091: 0x010e, # LATIN CAPITAL LETTER D WITH CARON
-        0x0092: 0x00ed, # LATIN SMALL LETTER I WITH ACUTE
-        0x0093: 0x010f, # LATIN SMALL LETTER D WITH CARON
-        0x0094: 0x0112, # LATIN CAPITAL LETTER E WITH MACRON
-        0x0095: 0x0113, # LATIN SMALL LETTER E WITH MACRON
-        0x0096: 0x0116, # LATIN CAPITAL LETTER E WITH DOT ABOVE
-        0x0097: 0x00f3, # LATIN SMALL LETTER O WITH ACUTE
-        0x0098: 0x0117, # LATIN SMALL LETTER E WITH DOT ABOVE
-        0x0099: 0x00f4, # LATIN SMALL LETTER O WITH CIRCUMFLEX
-        0x009a: 0x00f6, # LATIN SMALL LETTER O WITH DIAERESIS
-        0x009b: 0x00f5, # LATIN SMALL LETTER O WITH TILDE
-        0x009c: 0x00fa, # LATIN SMALL LETTER U WITH ACUTE
-        0x009d: 0x011a, # LATIN CAPITAL LETTER E WITH CARON
-        0x009e: 0x011b, # LATIN SMALL LETTER E WITH CARON
-        0x009f: 0x00fc, # LATIN SMALL LETTER U WITH DIAERESIS
-        0x00a0: 0x2020, # DAGGER
-        0x00a1: 0x00b0, # DEGREE SIGN
-        0x00a2: 0x0118, # LATIN CAPITAL LETTER E WITH OGONEK
-        0x00a4: 0x00a7, # SECTION SIGN
-        0x00a5: 0x2022, # BULLET
-        0x00a6: 0x00b6, # PILCROW SIGN
-        0x00a7: 0x00df, # LATIN SMALL LETTER SHARP S
-        0x00a8: 0x00ae, # REGISTERED SIGN
-        0x00aa: 0x2122, # TRADE MARK SIGN
-        0x00ab: 0x0119, # LATIN SMALL LETTER E WITH OGONEK
-        0x00ac: 0x00a8, # DIAERESIS
-        0x00ad: 0x2260, # NOT EQUAL TO
-        0x00ae: 0x0123, # LATIN SMALL LETTER G WITH CEDILLA
-        0x00af: 0x012e, # LATIN CAPITAL LETTER I WITH OGONEK
-        0x00b0: 0x012f, # LATIN SMALL LETTER I WITH OGONEK
-        0x00b1: 0x012a, # LATIN CAPITAL LETTER I WITH MACRON
-        0x00b2: 0x2264, # LESS-THAN OR EQUAL TO
-        0x00b3: 0x2265, # GREATER-THAN OR EQUAL TO
-        0x00b4: 0x012b, # LATIN SMALL LETTER I WITH MACRON
-        0x00b5: 0x0136, # LATIN CAPITAL LETTER K WITH CEDILLA
-        0x00b6: 0x2202, # PARTIAL DIFFERENTIAL
-        0x00b7: 0x2211, # N-ARY SUMMATION
-        0x00b8: 0x0142, # LATIN SMALL LETTER L WITH STROKE
-        0x00b9: 0x013b, # LATIN CAPITAL LETTER L WITH CEDILLA
-        0x00ba: 0x013c, # LATIN SMALL LETTER L WITH CEDILLA
-        0x00bb: 0x013d, # LATIN CAPITAL LETTER L WITH CARON
-        0x00bc: 0x013e, # LATIN SMALL LETTER L WITH CARON
-        0x00bd: 0x0139, # LATIN CAPITAL LETTER L WITH ACUTE
-        0x00be: 0x013a, # LATIN SMALL LETTER L WITH ACUTE
-        0x00bf: 0x0145, # LATIN CAPITAL LETTER N WITH CEDILLA
-        0x00c0: 0x0146, # LATIN SMALL LETTER N WITH CEDILLA
-        0x00c1: 0x0143, # LATIN CAPITAL LETTER N WITH ACUTE
-        0x00c2: 0x00ac, # NOT SIGN
-        0x00c3: 0x221a, # SQUARE ROOT
-        0x00c4: 0x0144, # LATIN SMALL LETTER N WITH ACUTE
-        0x00c5: 0x0147, # LATIN CAPITAL LETTER N WITH CARON
-        0x00c6: 0x2206, # INCREMENT
-        0x00c7: 0x00ab, # LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
-        0x00c8: 0x00bb, # RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
-        0x00c9: 0x2026, # HORIZONTAL ELLIPSIS
-        0x00ca: 0x00a0, # NO-BREAK SPACE
-        0x00cb: 0x0148, # LATIN SMALL LETTER N WITH CARON
-        0x00cc: 0x0150, # LATIN CAPITAL LETTER O WITH DOUBLE ACUTE
-        0x00cd: 0x00d5, # LATIN CAPITAL LETTER O WITH TILDE
-        0x00ce: 0x0151, # LATIN SMALL LETTER O WITH DOUBLE ACUTE
-        0x00cf: 0x014c, # LATIN CAPITAL LETTER O WITH MACRON
-        0x00d0: 0x2013, # EN DASH
-        0x00d1: 0x2014, # EM DASH
-        0x00d2: 0x201c, # LEFT DOUBLE QUOTATION MARK
-        0x00d3: 0x201d, # RIGHT DOUBLE QUOTATION MARK
-        0x00d4: 0x2018, # LEFT SINGLE QUOTATION MARK
-        0x00d5: 0x2019, # RIGHT SINGLE QUOTATION MARK
-        0x00d6: 0x00f7, # DIVISION SIGN
-        0x00d7: 0x25ca, # LOZENGE
-        0x00d8: 0x014d, # LATIN SMALL LETTER O WITH MACRON
-        0x00d9: 0x0154, # LATIN CAPITAL LETTER R WITH ACUTE
-        0x00da: 0x0155, # LATIN SMALL LETTER R WITH ACUTE
-        0x00db: 0x0158, # LATIN CAPITAL LETTER R WITH CARON
-        0x00dc: 0x2039, # SINGLE LEFT-POINTING ANGLE QUOTATION MARK
-        0x00dd: 0x203a, # SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
-        0x00de: 0x0159, # LATIN SMALL LETTER R WITH CARON
-        0x00df: 0x0156, # LATIN CAPITAL LETTER R WITH CEDILLA
-        0x00e0: 0x0157, # LATIN SMALL LETTER R WITH CEDILLA
-        0x00e1: 0x0160, # LATIN CAPITAL LETTER S WITH CARON
-        0x00e2: 0x201a, # SINGLE LOW-9 QUOTATION MARK
-        0x00e3: 0x201e, # DOUBLE LOW-9 QUOTATION MARK
-        0x00e4: 0x0161, # LATIN SMALL LETTER S WITH CARON
-        0x00e5: 0x015a, # LATIN CAPITAL LETTER S WITH ACUTE
-        0x00e6: 0x015b, # LATIN SMALL LETTER S WITH ACUTE
-        0x00e7: 0x00c1, # LATIN CAPITAL LETTER A WITH ACUTE
-        0x00e8: 0x0164, # LATIN CAPITAL LETTER T WITH CARON
-        0x00e9: 0x0165, # LATIN SMALL LETTER T WITH CARON
-        0x00ea: 0x00cd, # LATIN CAPITAL LETTER I WITH ACUTE
-        0x00eb: 0x017d, # LATIN CAPITAL LETTER Z WITH CARON
-        0x00ec: 0x017e, # LATIN SMALL LETTER Z WITH CARON
-        0x00ed: 0x016a, # LATIN CAPITAL LETTER U WITH MACRON
-        0x00ee: 0x00d3, # LATIN CAPITAL LETTER O WITH ACUTE
-        0x00ef: 0x00d4, # LATIN CAPITAL LETTER O WITH CIRCUMFLEX
-        0x00f0: 0x016b, # LATIN SMALL LETTER U WITH MACRON
-        0x00f1: 0x016e, # LATIN CAPITAL LETTER U WITH RING ABOVE
-        0x00f2: 0x00da, # LATIN CAPITAL LETTER U WITH ACUTE
-        0x00f3: 0x016f, # LATIN SMALL LETTER U WITH RING ABOVE
-        0x00f4: 0x0170, # LATIN CAPITAL LETTER U WITH DOUBLE ACUTE
-        0x00f5: 0x0171, # LATIN SMALL LETTER U WITH DOUBLE ACUTE
-        0x00f6: 0x0172, # LATIN CAPITAL LETTER U WITH OGONEK
-        0x00f7: 0x0173, # LATIN SMALL LETTER U WITH OGONEK
-        0x00f8: 0x00dd, # LATIN CAPITAL LETTER Y WITH ACUTE
-        0x00f9: 0x00fd, # LATIN SMALL LETTER Y WITH ACUTE
-        0x00fa: 0x0137, # LATIN SMALL LETTER K WITH CEDILLA
-        0x00fb: 0x017b, # LATIN CAPITAL LETTER Z WITH DOT ABOVE
-        0x00fc: 0x0141, # LATIN CAPITAL LETTER L WITH STROKE
-        0x00fd: 0x017c, # LATIN SMALL LETTER Z WITH DOT ABOVE
-        0x00fe: 0x0122, # LATIN CAPITAL LETTER G WITH CEDILLA
-        0x00ff: 0x02c7, # CARON
-})
+### Decoding Table
 
-### Encoding Map
+decoding_table = (
+    '\x00'     #  0x00 -> NULL
+    '\x01'     #  0x01 -> START OF HEADING
+    '\x02'     #  0x02 -> START OF TEXT
+    '\x03'     #  0x03 -> END OF TEXT
+    '\x04'     #  0x04 -> END OF TRANSMISSION
+    '\x05'     #  0x05 -> ENQUIRY
+    '\x06'     #  0x06 -> ACKNOWLEDGE
+    '\x07'     #  0x07 -> BELL
+    '\x08'     #  0x08 -> BACKSPACE
+    '\t'       #  0x09 -> HORIZONTAL TABULATION
+    '\n'       #  0x0A -> LINE FEED
+    '\x0b'     #  0x0B -> VERTICAL TABULATION
+    '\x0c'     #  0x0C -> FORM FEED
+    '\r'       #  0x0D -> CARRIAGE RETURN
+    '\x0e'     #  0x0E -> SHIFT OUT
+    '\x0f'     #  0x0F -> SHIFT IN
+    '\x10'     #  0x10 -> DATA LINK ESCAPE
+    '\x11'     #  0x11 -> DEVICE CONTROL ONE
+    '\x12'     #  0x12 -> DEVICE CONTROL TWO
+    '\x13'     #  0x13 -> DEVICE CONTROL THREE
+    '\x14'     #  0x14 -> DEVICE CONTROL FOUR
+    '\x15'     #  0x15 -> NEGATIVE ACKNOWLEDGE
+    '\x16'     #  0x16 -> SYNCHRONOUS IDLE
+    '\x17'     #  0x17 -> END OF TRANSMISSION BLOCK
+    '\x18'     #  0x18 -> CANCEL
+    '\x19'     #  0x19 -> END OF MEDIUM
+    '\x1a'     #  0x1A -> SUBSTITUTE
+    '\x1b'     #  0x1B -> ESCAPE
+    '\x1c'     #  0x1C -> FILE SEPARATOR
+    '\x1d'     #  0x1D -> GROUP SEPARATOR
+    '\x1e'     #  0x1E -> RECORD SEPARATOR
+    '\x1f'     #  0x1F -> UNIT SEPARATOR
+    ' '        #  0x20 -> SPACE
+    '!'        #  0x21 -> EXCLAMATION MARK
+    '"'        #  0x22 -> QUOTATION MARK
+    '#'        #  0x23 -> NUMBER SIGN
+    '$'        #  0x24 -> DOLLAR SIGN
+    '%'        #  0x25 -> PERCENT SIGN
+    '&'        #  0x26 -> AMPERSAND
+    "'"        #  0x27 -> APOSTROPHE
+    '('        #  0x28 -> LEFT PARENTHESIS
+    ')'        #  0x29 -> RIGHT PARENTHESIS
+    '*'        #  0x2A -> ASTERISK
+    '+'        #  0x2B -> PLUS SIGN
+    ','        #  0x2C -> COMMA
+    '-'        #  0x2D -> HYPHEN-MINUS
+    '.'        #  0x2E -> FULL STOP
+    '/'        #  0x2F -> SOLIDUS
+    '0'        #  0x30 -> DIGIT ZERO
+    '1'        #  0x31 -> DIGIT ONE
+    '2'        #  0x32 -> DIGIT TWO
+    '3'        #  0x33 -> DIGIT THREE
+    '4'        #  0x34 -> DIGIT FOUR
+    '5'        #  0x35 -> DIGIT FIVE
+    '6'        #  0x36 -> DIGIT SIX
+    '7'        #  0x37 -> DIGIT SEVEN
+    '8'        #  0x38 -> DIGIT EIGHT
+    '9'        #  0x39 -> DIGIT NINE
+    ':'        #  0x3A -> COLON
+    ';'        #  0x3B -> SEMICOLON
+    '<'        #  0x3C -> LESS-THAN SIGN
+    '='        #  0x3D -> EQUALS SIGN
+    '>'        #  0x3E -> GREATER-THAN SIGN
+    '?'        #  0x3F -> QUESTION MARK
+    '@'        #  0x40 -> COMMERCIAL AT
+    'A'        #  0x41 -> LATIN CAPITAL LETTER A
+    'B'        #  0x42 -> LATIN CAPITAL LETTER B
+    'C'        #  0x43 -> LATIN CAPITAL LETTER C
+    'D'        #  0x44 -> LATIN CAPITAL LETTER D
+    'E'        #  0x45 -> LATIN CAPITAL LETTER E
+    'F'        #  0x46 -> LATIN CAPITAL LETTER F
+    'G'        #  0x47 -> LATIN CAPITAL LETTER G
+    'H'        #  0x48 -> LATIN CAPITAL LETTER H
+    'I'        #  0x49 -> LATIN CAPITAL LETTER I
+    'J'        #  0x4A -> LATIN CAPITAL LETTER J
+    'K'        #  0x4B -> LATIN CAPITAL LETTER K
+    'L'        #  0x4C -> LATIN CAPITAL LETTER L
+    'M'        #  0x4D -> LATIN CAPITAL LETTER M
+    'N'        #  0x4E -> LATIN CAPITAL LETTER N
+    'O'        #  0x4F -> LATIN CAPITAL LETTER O
+    'P'        #  0x50 -> LATIN CAPITAL LETTER P
+    'Q'        #  0x51 -> LATIN CAPITAL LETTER Q
+    'R'        #  0x52 -> LATIN CAPITAL LETTER R
+    'S'        #  0x53 -> LATIN CAPITAL LETTER S
+    'T'        #  0x54 -> LATIN CAPITAL LETTER T
+    'U'        #  0x55 -> LATIN CAPITAL LETTER U
+    'V'        #  0x56 -> LATIN CAPITAL LETTER V
+    'W'        #  0x57 -> LATIN CAPITAL LETTER W
+    'X'        #  0x58 -> LATIN CAPITAL LETTER X
+    'Y'        #  0x59 -> LATIN CAPITAL LETTER Y
+    'Z'        #  0x5A -> LATIN CAPITAL LETTER Z
+    '['        #  0x5B -> LEFT SQUARE BRACKET
+    '\\'       #  0x5C -> REVERSE SOLIDUS
+    ']'        #  0x5D -> RIGHT SQUARE BRACKET
+    '^'        #  0x5E -> CIRCUMFLEX ACCENT
+    '_'        #  0x5F -> LOW LINE
+    '`'        #  0x60 -> GRAVE ACCENT
+    'a'        #  0x61 -> LATIN SMALL LETTER A
+    'b'        #  0x62 -> LATIN SMALL LETTER B
+    'c'        #  0x63 -> LATIN SMALL LETTER C
+    'd'        #  0x64 -> LATIN SMALL LETTER D
+    'e'        #  0x65 -> LATIN SMALL LETTER E
+    'f'        #  0x66 -> LATIN SMALL LETTER F
+    'g'        #  0x67 -> LATIN SMALL LETTER G
+    'h'        #  0x68 -> LATIN SMALL LETTER H
+    'i'        #  0x69 -> LATIN SMALL LETTER I
+    'j'        #  0x6A -> LATIN SMALL LETTER J
+    'k'        #  0x6B -> LATIN SMALL LETTER K
+    'l'        #  0x6C -> LATIN SMALL LETTER L
+    'm'        #  0x6D -> LATIN SMALL LETTER M
+    'n'        #  0x6E -> LATIN SMALL LETTER N
+    'o'        #  0x6F -> LATIN SMALL LETTER O
+    'p'        #  0x70 -> LATIN SMALL LETTER P
+    'q'        #  0x71 -> LATIN SMALL LETTER Q
+    'r'        #  0x72 -> LATIN SMALL LETTER R
+    's'        #  0x73 -> LATIN SMALL LETTER S
+    't'        #  0x74 -> LATIN SMALL LETTER T
+    'u'        #  0x75 -> LATIN SMALL LETTER U
+    'v'        #  0x76 -> LATIN SMALL LETTER V
+    'w'        #  0x77 -> LATIN SMALL LETTER W
+    'x'        #  0x78 -> LATIN SMALL LETTER X
+    'y'        #  0x79 -> LATIN SMALL LETTER Y
+    'z'        #  0x7A -> LATIN SMALL LETTER Z
+    '{'        #  0x7B -> LEFT CURLY BRACKET
+    '|'        #  0x7C -> VERTICAL LINE
+    '}'        #  0x7D -> RIGHT CURLY BRACKET
+    '~'        #  0x7E -> TILDE
+    '\x7f'     #  0x7F -> DELETE
+    '\xc4'     #  0x80 -> LATIN CAPITAL LETTER A WITH DIAERESIS
+    '\u0100'   #  0x81 -> LATIN CAPITAL LETTER A WITH MACRON
+    '\u0101'   #  0x82 -> LATIN SMALL LETTER A WITH MACRON
+    '\xc9'     #  0x83 -> LATIN CAPITAL LETTER E WITH ACUTE
+    '\u0104'   #  0x84 -> LATIN CAPITAL LETTER A WITH OGONEK
+    '\xd6'     #  0x85 -> LATIN CAPITAL LETTER O WITH DIAERESIS
+    '\xdc'     #  0x86 -> LATIN CAPITAL LETTER U WITH DIAERESIS
+    '\xe1'     #  0x87 -> LATIN SMALL LETTER A WITH ACUTE
+    '\u0105'   #  0x88 -> LATIN SMALL LETTER A WITH OGONEK
+    '\u010c'   #  0x89 -> LATIN CAPITAL LETTER C WITH CARON
+    '\xe4'     #  0x8A -> LATIN SMALL LETTER A WITH DIAERESIS
+    '\u010d'   #  0x8B -> LATIN SMALL LETTER C WITH CARON
+    '\u0106'   #  0x8C -> LATIN CAPITAL LETTER C WITH ACUTE
+    '\u0107'   #  0x8D -> LATIN SMALL LETTER C WITH ACUTE
+    '\xe9'     #  0x8E -> LATIN SMALL LETTER E WITH ACUTE
+    '\u0179'   #  0x8F -> LATIN CAPITAL LETTER Z WITH ACUTE
+    '\u017a'   #  0x90 -> LATIN SMALL LETTER Z WITH ACUTE
+    '\u010e'   #  0x91 -> LATIN CAPITAL LETTER D WITH CARON
+    '\xed'     #  0x92 -> LATIN SMALL LETTER I WITH ACUTE
+    '\u010f'   #  0x93 -> LATIN SMALL LETTER D WITH CARON
+    '\u0112'   #  0x94 -> LATIN CAPITAL LETTER E WITH MACRON
+    '\u0113'   #  0x95 -> LATIN SMALL LETTER E WITH MACRON
+    '\u0116'   #  0x96 -> LATIN CAPITAL LETTER E WITH DOT ABOVE
+    '\xf3'     #  0x97 -> LATIN SMALL LETTER O WITH ACUTE
+    '\u0117'   #  0x98 -> LATIN SMALL LETTER E WITH DOT ABOVE
+    '\xf4'     #  0x99 -> LATIN SMALL LETTER O WITH CIRCUMFLEX
+    '\xf6'     #  0x9A -> LATIN SMALL LETTER O WITH DIAERESIS
+    '\xf5'     #  0x9B -> LATIN SMALL LETTER O WITH TILDE
+    '\xfa'     #  0x9C -> LATIN SMALL LETTER U WITH ACUTE
+    '\u011a'   #  0x9D -> LATIN CAPITAL LETTER E WITH CARON
+    '\u011b'   #  0x9E -> LATIN SMALL LETTER E WITH CARON
+    '\xfc'     #  0x9F -> LATIN SMALL LETTER U WITH DIAERESIS
+    '\u2020'   #  0xA0 -> DAGGER
+    '\xb0'     #  0xA1 -> DEGREE SIGN
+    '\u0118'   #  0xA2 -> LATIN CAPITAL LETTER E WITH OGONEK
+    '\xa3'     #  0xA3 -> POUND SIGN
+    '\xa7'     #  0xA4 -> SECTION SIGN
+    '\u2022'   #  0xA5 -> BULLET
+    '\xb6'     #  0xA6 -> PILCROW SIGN
+    '\xdf'     #  0xA7 -> LATIN SMALL LETTER SHARP S
+    '\xae'     #  0xA8 -> REGISTERED SIGN
+    '\xa9'     #  0xA9 -> COPYRIGHT SIGN
+    '\u2122'   #  0xAA -> TRADE MARK SIGN
+    '\u0119'   #  0xAB -> LATIN SMALL LETTER E WITH OGONEK
+    '\xa8'     #  0xAC -> DIAERESIS
+    '\u2260'   #  0xAD -> NOT EQUAL TO
+    '\u0123'   #  0xAE -> LATIN SMALL LETTER G WITH CEDILLA
+    '\u012e'   #  0xAF -> LATIN CAPITAL LETTER I WITH OGONEK
+    '\u012f'   #  0xB0 -> LATIN SMALL LETTER I WITH OGONEK
+    '\u012a'   #  0xB1 -> LATIN CAPITAL LETTER I WITH MACRON
+    '\u2264'   #  0xB2 -> LESS-THAN OR EQUAL TO
+    '\u2265'   #  0xB3 -> GREATER-THAN OR EQUAL TO
+    '\u012b'   #  0xB4 -> LATIN SMALL LETTER I WITH MACRON
+    '\u0136'   #  0xB5 -> LATIN CAPITAL LETTER K WITH CEDILLA
+    '\u2202'   #  0xB6 -> PARTIAL DIFFERENTIAL
+    '\u2211'   #  0xB7 -> N-ARY SUMMATION
+    '\u0142'   #  0xB8 -> LATIN SMALL LETTER L WITH STROKE
+    '\u013b'   #  0xB9 -> LATIN CAPITAL LETTER L WITH CEDILLA
+    '\u013c'   #  0xBA -> LATIN SMALL LETTER L WITH CEDILLA
+    '\u013d'   #  0xBB -> LATIN CAPITAL LETTER L WITH CARON
+    '\u013e'   #  0xBC -> LATIN SMALL LETTER L WITH CARON
+    '\u0139'   #  0xBD -> LATIN CAPITAL LETTER L WITH ACUTE
+    '\u013a'   #  0xBE -> LATIN SMALL LETTER L WITH ACUTE
+    '\u0145'   #  0xBF -> LATIN CAPITAL LETTER N WITH CEDILLA
+    '\u0146'   #  0xC0 -> LATIN SMALL LETTER N WITH CEDILLA
+    '\u0143'   #  0xC1 -> LATIN CAPITAL LETTER N WITH ACUTE
+    '\xac'     #  0xC2 -> NOT SIGN
+    '\u221a'   #  0xC3 -> SQUARE ROOT
+    '\u0144'   #  0xC4 -> LATIN SMALL LETTER N WITH ACUTE
+    '\u0147'   #  0xC5 -> LATIN CAPITAL LETTER N WITH CARON
+    '\u2206'   #  0xC6 -> INCREMENT
+    '\xab'     #  0xC7 -> LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
+    '\xbb'     #  0xC8 -> RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
+    '\u2026'   #  0xC9 -> HORIZONTAL ELLIPSIS
+    '\xa0'     #  0xCA -> NO-BREAK SPACE
+    '\u0148'   #  0xCB -> LATIN SMALL LETTER N WITH CARON
+    '\u0150'   #  0xCC -> LATIN CAPITAL LETTER O WITH DOUBLE ACUTE
+    '\xd5'     #  0xCD -> LATIN CAPITAL LETTER O WITH TILDE
+    '\u0151'   #  0xCE -> LATIN SMALL LETTER O WITH DOUBLE ACUTE
+    '\u014c'   #  0xCF -> LATIN CAPITAL LETTER O WITH MACRON
+    '\u2013'   #  0xD0 -> EN DASH
+    '\u2014'   #  0xD1 -> EM DASH
+    '\u201c'   #  0xD2 -> LEFT DOUBLE QUOTATION MARK
+    '\u201d'   #  0xD3 -> RIGHT DOUBLE QUOTATION MARK
+    '\u2018'   #  0xD4 -> LEFT SINGLE QUOTATION MARK
+    '\u2019'   #  0xD5 -> RIGHT SINGLE QUOTATION MARK
+    '\xf7'     #  0xD6 -> DIVISION SIGN
+    '\u25ca'   #  0xD7 -> LOZENGE
+    '\u014d'   #  0xD8 -> LATIN SMALL LETTER O WITH MACRON
+    '\u0154'   #  0xD9 -> LATIN CAPITAL LETTER R WITH ACUTE
+    '\u0155'   #  0xDA -> LATIN SMALL LETTER R WITH ACUTE
+    '\u0158'   #  0xDB -> LATIN CAPITAL LETTER R WITH CARON
+    '\u2039'   #  0xDC -> SINGLE LEFT-POINTING ANGLE QUOTATION MARK
+    '\u203a'   #  0xDD -> SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
+    '\u0159'   #  0xDE -> LATIN SMALL LETTER R WITH CARON
+    '\u0156'   #  0xDF -> LATIN CAPITAL LETTER R WITH CEDILLA
+    '\u0157'   #  0xE0 -> LATIN SMALL LETTER R WITH CEDILLA
+    '\u0160'   #  0xE1 -> LATIN CAPITAL LETTER S WITH CARON
+    '\u201a'   #  0xE2 -> SINGLE LOW-9 QUOTATION MARK
+    '\u201e'   #  0xE3 -> DOUBLE LOW-9 QUOTATION MARK
+    '\u0161'   #  0xE4 -> LATIN SMALL LETTER S WITH CARON
+    '\u015a'   #  0xE5 -> LATIN CAPITAL LETTER S WITH ACUTE
+    '\u015b'   #  0xE6 -> LATIN SMALL LETTER S WITH ACUTE
+    '\xc1'     #  0xE7 -> LATIN CAPITAL LETTER A WITH ACUTE
+    '\u0164'   #  0xE8 -> LATIN CAPITAL LETTER T WITH CARON
+    '\u0165'   #  0xE9 -> LATIN SMALL LETTER T WITH CARON
+    '\xcd'     #  0xEA -> LATIN CAPITAL LETTER I WITH ACUTE
+    '\u017d'   #  0xEB -> LATIN CAPITAL LETTER Z WITH CARON
+    '\u017e'   #  0xEC -> LATIN SMALL LETTER Z WITH CARON
+    '\u016a'   #  0xED -> LATIN CAPITAL LETTER U WITH MACRON
+    '\xd3'     #  0xEE -> LATIN CAPITAL LETTER O WITH ACUTE
+    '\xd4'     #  0xEF -> LATIN CAPITAL LETTER O WITH CIRCUMFLEX
+    '\u016b'   #  0xF0 -> LATIN SMALL LETTER U WITH MACRON
+    '\u016e'   #  0xF1 -> LATIN CAPITAL LETTER U WITH RING ABOVE
+    '\xda'     #  0xF2 -> LATIN CAPITAL LETTER U WITH ACUTE
+    '\u016f'   #  0xF3 -> LATIN SMALL LETTER U WITH RING ABOVE
+    '\u0170'   #  0xF4 -> LATIN CAPITAL LETTER U WITH DOUBLE ACUTE
+    '\u0171'   #  0xF5 -> LATIN SMALL LETTER U WITH DOUBLE ACUTE
+    '\u0172'   #  0xF6 -> LATIN CAPITAL LETTER U WITH OGONEK
+    '\u0173'   #  0xF7 -> LATIN SMALL LETTER U WITH OGONEK
+    '\xdd'     #  0xF8 -> LATIN CAPITAL LETTER Y WITH ACUTE
+    '\xfd'     #  0xF9 -> LATIN SMALL LETTER Y WITH ACUTE
+    '\u0137'   #  0xFA -> LATIN SMALL LETTER K WITH CEDILLA
+    '\u017b'   #  0xFB -> LATIN CAPITAL LETTER Z WITH DOT ABOVE
+    '\u0141'   #  0xFC -> LATIN CAPITAL LETTER L WITH STROKE
+    '\u017c'   #  0xFD -> LATIN SMALL LETTER Z WITH DOT ABOVE
+    '\u0122'   #  0xFE -> LATIN CAPITAL LETTER G WITH CEDILLA
+    '\u02c7'   #  0xFF -> CARON
+)
 
-encoding_map = codecs.make_encoding_map(decoding_map)
+### Encoding table
+encoding_table=codecs.charmap_build(decoding_table)

File Lib/encodings/palmos.py

 
 class Codec(codecs.Codec):
     def encode(self,input,errors='strict'):
-        return codecs.charmap_encode(input,errors,encoding_map)
+        return codecs.charmap_encode(input,errors,encoding_table)
 
     def decode(self,input,errors='strict'):
-        return codecs.charmap_decode(input,errors,decoding_map)
+        return codecs.charmap_decode(input,errors,decoding_table)
 
 class IncrementalEncoder(codecs.IncrementalEncoder):
     def encode(self, input, final=False):
-        return codecs.charmap_encode(input,self.errors,encoding_map)[0]
+        return codecs.charmap_encode(input,self.errors,encoding_table)[0]
 
 class IncrementalDecoder(codecs.IncrementalDecoder):
     def decode(self, input, final=False):
-        return codecs.charmap_decode(input,self.errors,decoding_map)[0]
+        return codecs.charmap_decode(input,self.errors,decoding_table)[0]
 
 class StreamWriter(Codec,codecs.StreamWriter):
     pass
         streamwriter=StreamWriter,
     )
 
-### Decoding Map
 
-decoding_map = codecs.make_identity_dict(range(256))
+### Decoding Table
 
-# The PalmOS character set is mostly iso-8859-1 with some differences.
-decoding_map.update({
-        0x0080: 0x20ac, #       EURO SIGN
-        0x0082: 0x201a, #       SINGLE LOW-9 QUOTATION MARK
-        0x0083: 0x0192, #       LATIN SMALL LETTER F WITH HOOK
-        0x0084: 0x201e, #       DOUBLE LOW-9 QUOTATION MARK
-        0x0085: 0x2026, #       HORIZONTAL ELLIPSIS
-        0x0086: 0x2020, #       DAGGER
-        0x0087: 0x2021, #       DOUBLE DAGGER
-        0x0088: 0x02c6, #       MODIFIER LETTER CIRCUMFLEX ACCENT
-        0x0089: 0x2030, #       PER MILLE SIGN
-        0x008a: 0x0160, #       LATIN CAPITAL LETTER S WITH CARON
-        0x008b: 0x2039, #       SINGLE LEFT-POINTING ANGLE QUOTATION MARK
-        0x008c: 0x0152, #       LATIN CAPITAL LIGATURE OE
-        0x008d: 0x2666, #       BLACK DIAMOND SUIT
-        0x008e: 0x2663, #       BLACK CLUB SUIT
-        0x008f: 0x2665, #       BLACK HEART SUIT
-        0x0090: 0x2660, #       BLACK SPADE SUIT
-        0x0091: 0x2018, #       LEFT SINGLE QUOTATION MARK
-        0x0092: 0x2019, #       RIGHT SINGLE QUOTATION MARK
-        0x0093: 0x201c, #       LEFT DOUBLE QUOTATION MARK
-        0x0094: 0x201d, #       RIGHT DOUBLE QUOTATION MARK
-        0x0095: 0x2022, #       BULLET
-        0x0096: 0x2013, #       EN DASH
-        0x0097: 0x2014, #       EM DASH
-        0x0098: 0x02dc, #       SMALL TILDE
-        0x0099: 0x2122, #       TRADE MARK SIGN
-        0x009a: 0x0161, #       LATIN SMALL LETTER S WITH CARON
-        0x009c: 0x0153, #       LATIN SMALL LIGATURE OE
-        0x009f: 0x0178, #       LATIN CAPITAL LETTER Y WITH DIAERESIS
-})
+decoding_table = (
+    '\x00'     #  0x00 -> NULL
+    '\x01'     #  0x01 -> START OF HEADING
+    '\x02'     #  0x02 -> START OF TEXT
+    '\x03'     #  0x03 -> END OF TEXT
+    '\x04'     #  0x04 -> END OF TRANSMISSION
+    '\x05'     #  0x05 -> ENQUIRY
+    '\x06'     #  0x06 -> ACKNOWLEDGE
+    '\x07'     #  0x07 -> BELL
+    '\x08'     #  0x08 -> BACKSPACE
+    '\t'       #  0x09 -> HORIZONTAL TABULATION
+    '\n'       #  0x0A -> LINE FEED
+    '\x0b'     #  0x0B -> VERTICAL TABULATION
+    '\x0c'     #  0x0C -> FORM FEED
+    '\r'       #  0x0D -> CARRIAGE RETURN
+    '\x0e'     #  0x0E -> SHIFT OUT
+    '\x0f'     #  0x0F -> SHIFT IN
+    '\x10'     #  0x10 -> DATA LINK ESCAPE
+    '\x11'     #  0x11 -> DEVICE CONTROL ONE
+    '\x12'     #  0x12 -> DEVICE CONTROL TWO
+    '\x13'     #  0x13 -> DEVICE CONTROL THREE
+    '\x14'     #  0x14 -> DEVICE CONTROL FOUR
+    '\x15'     #  0x15 -> NEGATIVE ACKNOWLEDGE
+    '\x16'     #  0x16 -> SYNCHRONOUS IDLE
+    '\x17'     #  0x17 -> END OF TRANSMISSION BLOCK
+    '\x18'     #  0x18 -> CANCEL
+    '\x19'     #  0x19 -> END OF MEDIUM
+    '\x1a'     #  0x1A -> SUBSTITUTE
+    '\x1b'     #  0x1B -> ESCAPE
+    '\x1c'     #  0x1C -> FILE SEPARATOR
+    '\x1d'     #  0x1D -> GROUP SEPARATOR
+    '\x1e'     #  0x1E -> RECORD SEPARATOR
+    '\x1f'     #  0x1F -> UNIT SEPARATOR
+    ' '        #  0x20 -> SPACE
+    '!'        #  0x21 -> EXCLAMATION MARK
+    '"'        #  0x22 -> QUOTATION MARK
+    '#'        #  0x23 -> NUMBER SIGN
+    '$'        #  0x24 -> DOLLAR SIGN
+    '%'        #  0x25 -> PERCENT SIGN
+    '&'        #  0x26 -> AMPERSAND
+    "'"        #  0x27 -> APOSTROPHE
+    '('        #  0x28 -> LEFT PARENTHESIS
+    ')'        #  0x29 -> RIGHT PARENTHESIS
+    '*'        #  0x2A -> ASTERISK
+    '+'        #  0x2B -> PLUS SIGN
+    ','        #  0x2C -> COMMA
+    '-'        #  0x2D -> HYPHEN-MINUS
+    '.'        #  0x2E -> FULL STOP
+    '/'        #  0x2F -> SOLIDUS
+    '0'        #  0x30 -> DIGIT ZERO
+    '1'        #  0x31 -> DIGIT ONE
+    '2'        #  0x32 -> DIGIT TWO
+    '3'        #  0x33 -> DIGIT THREE
+    '4'        #  0x34 -> DIGIT FOUR
+    '5'        #  0x35 -> DIGIT FIVE
+    '6'        #  0x36 -> DIGIT SIX
+    '7'        #  0x37 -> DIGIT SEVEN
+    '8'        #  0x38 -> DIGIT EIGHT
+    '9'        #  0x39 -> DIGIT NINE
+    ':'        #  0x3A -> COLON
+    ';'        #  0x3B -> SEMICOLON
+    '<'        #  0x3C -> LESS-THAN SIGN
+    '='        #  0x3D -> EQUALS SIGN
+    '>'        #  0x3E -> GREATER-THAN SIGN
+    '?'        #  0x3F -> QUESTION MARK
+    '@'        #  0x40 -> COMMERCIAL AT
+    'A'        #  0x41 -> LATIN CAPITAL LETTER A
+    'B'        #  0x42 -> LATIN CAPITAL LETTER B
+    'C'        #  0x43 -> LATIN CAPITAL LETTER C
+    'D'        #  0x44 -> LATIN CAPITAL LETTER D
+    'E'        #  0x45 -> LATIN CAPITAL LETTER E
+    'F'        #  0x46 -> LATIN CAPITAL LETTER F
+    'G'        #  0x47 -> LATIN CAPITAL LETTER G
+    'H'        #  0x48 -> LATIN CAPITAL LETTER H
+    'I'        #  0x49 -> LATIN CAPITAL LETTER I
+    'J'        #  0x4A -> LATIN CAPITAL LETTER J
+    'K'        #  0x4B -> LATIN CAPITAL LETTER K
+    'L'        #  0x4C -> LATIN CAPITAL LETTER L
+    'M'        #  0x4D -> LATIN CAPITAL LETTER M
+    'N'        #  0x4E -> LATIN CAPITAL LETTER N
+    'O'        #  0x4F -> LATIN CAPITAL LETTER O
+    'P'        #  0x50 -> LATIN CAPITAL LETTER P
+    'Q'        #  0x51 -> LATIN CAPITAL LETTER Q
+    'R'        #  0x52 -> LATIN CAPITAL LETTER R
+    'S'        #  0x53 -> LATIN CAPITAL LETTER S
+    'T'        #  0x54 -> LATIN CAPITAL LETTER T
+    'U'        #  0x55 -> LATIN CAPITAL LETTER U
+    'V'        #  0x56 -> LATIN CAPITAL LETTER V
+    'W'        #  0x57 -> LATIN CAPITAL LETTER W
+    'X'        #  0x58 -> LATIN CAPITAL LETTER X
+    'Y'        #  0x59 -> LATIN CAPITAL LETTER Y
+    'Z'        #  0x5A -> LATIN CAPITAL LETTER Z
+    '['        #  0x5B -> LEFT SQUARE BRACKET
+    '\\'       #  0x5C -> REVERSE SOLIDUS
+    ']'        #  0x5D -> RIGHT SQUARE BRACKET
+    '^'        #  0x5E -> CIRCUMFLEX ACCENT
+    '_'        #  0x5F -> LOW LINE
+    '`'        #  0x60 -> GRAVE ACCENT
+    'a'        #  0x61 -> LATIN SMALL LETTER A
+    'b'        #  0x62 -> LATIN SMALL LETTER B
+    'c'        #  0x63 -> LATIN SMALL LETTER C
+    'd'        #  0x64 -> LATIN SMALL LETTER D
+    'e'        #  0x65 -> LATIN SMALL LETTER E
+    'f'        #  0x66 -> LATIN SMALL LETTER F
+    'g'        #  0x67 -> LATIN SMALL LETTER G
+    'h'        #  0x68 -> LATIN SMALL LETTER H
+    'i'        #  0x69 -> LATIN SMALL LETTER I
+    'j'        #  0x6A -> LATIN SMALL LETTER J
+    'k'        #  0x6B -> LATIN SMALL LETTER K
+    'l'        #  0x6C -> LATIN SMALL LETTER L
+    'm'        #  0x6D -> LATIN SMALL LETTER M
+    'n'        #  0x6E -> LATIN SMALL LETTER N
+    'o'        #  0x6F -> LATIN SMALL LETTER O
+    'p'        #  0x70 -> LATIN SMALL LETTER P
+    'q'        #  0x71 -> LATIN SMALL LETTER Q
+    'r'        #  0x72 -> LATIN SMALL LETTER R
+    's'        #  0x73 -> LATIN SMALL LETTER S
+    't'        #  0x74 -> LATIN SMALL LETTER T
+    'u'        #  0x75 -> LATIN SMALL LETTER U
+    'v'        #  0x76 -> LATIN SMALL LETTER V
+    'w'        #  0x77 -> LATIN SMALL LETTER W
+    'x'        #  0x78 -> LATIN SMALL LETTER X
+    'y'        #  0x79 -> LATIN SMALL LETTER Y
+    'z'        #  0x7A -> LATIN SMALL LETTER Z
+    '{'        #  0x7B -> LEFT CURLY BRACKET
+    '|'        #  0x7C -> VERTICAL LINE
+    '}'        #  0x7D -> RIGHT CURLY BRACKET
+    '~'        #  0x7E -> TILDE
+    '\x7f'     #  0x7F -> DELETE
+    '\u20ac'   #  0x80 -> EURO SIGN
+    '\x81'     #  0x81 -> <control>
+    '\u201a'   #  0x82 -> SINGLE LOW-9 QUOTATION MARK
+    '\u0192'   #  0x83 -> LATIN SMALL LETTER F WITH HOOK
+    '\u201e'   #  0x84 -> DOUBLE LOW-9 QUOTATION MARK
+    '\u2026'   #  0x85 -> HORIZONTAL ELLIPSIS
+    '\u2020'   #  0x86 -> DAGGER
+    '\u2021'   #  0x87 -> DOUBLE DAGGER
+    '\u02c6'   #  0x88 -> MODIFIER LETTER CIRCUMFLEX ACCENT
+    '\u2030'   #  0x89 -> PER MILLE SIGN
+    '\u0160'   #  0x8A -> LATIN CAPITAL LETTER S WITH CARON
+    '\u2039'   #  0x8B -> SINGLE LEFT-POINTING ANGLE QUOTATION MARK
+    '\u0152'   #  0x8C -> LATIN CAPITAL LIGATURE OE
+    '\u2666'   #  0x8D -> BLACK DIAMOND SUIT
+    '\u2663'   #  0x8E -> BLACK CLUB SUIT
+    '\u2665'   #  0x8F -> BLACK HEART SUIT
+    '\u2660'   #  0x90 -> BLACK SPADE SUIT
+    '\u2018'   #  0x91 -> LEFT SINGLE QUOTATION MARK
+    '\u2019'   #  0x92 -> RIGHT SINGLE QUOTATION MARK
+    '\u201c'   #  0x93 -> LEFT DOUBLE QUOTATION MARK
+    '\u201d'   #  0x94 -> RIGHT DOUBLE QUOTATION MARK
+    '\u2022'   #  0x95 -> BULLET
+    '\u2013'   #  0x96 -> EN DASH
+    '\u2014'   #  0x97 -> EM DASH
+    '\u02dc'   #  0x98 -> SMALL TILDE
+    '\u2122'   #  0x99 -> TRADE MARK SIGN
+    '\u0161'   #  0x9A -> LATIN SMALL LETTER S WITH CARON
+    '\x9b'     #  0x9B -> <control>
+    '\u0153'   #  0x9C -> LATIN SMALL LIGATURE OE
+    '\x9d'     #  0x9D -> <control>
+    '\x9e'     #  0x9E -> <control>
+    '\u0178'   #  0x9F -> LATIN CAPITAL LETTER Y WITH DIAERESIS
+    '\xa0'     #  0xA0 -> NO-BREAK SPACE
+    '\xa1'     #  0xA1 -> INVERTED EXCLAMATION MARK
+    '\xa2'     #  0xA2 -> CENT SIGN
+    '\xa3'     #  0xA3 -> POUND SIGN
+    '\xa4'     #  0xA4 -> CURRENCY SIGN
+    '\xa5'     #  0xA5 -> YEN SIGN
+    '\xa6'     #  0xA6 -> BROKEN BAR
+    '\xa7'     #  0xA7 -> SECTION SIGN
+    '\xa8'     #  0xA8 -> DIAERESIS
+    '\xa9'     #  0xA9 -> COPYRIGHT SIGN
+    '\xaa'     #  0xAA -> FEMININE ORDINAL INDICATOR
+    '\xab'     #  0xAB -> LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
+    '\xac'     #  0xAC -> NOT SIGN
+    '\xad'     #  0xAD -> SOFT HYPHEN
+    '\xae'     #  0xAE -> REGISTERED SIGN
+    '\xaf'     #  0xAF -> MACRON
+    '\xb0'     #  0xB0 -> DEGREE SIGN
+    '\xb1'     #  0xB1 -> PLUS-MINUS SIGN
+    '\xb2'     #  0xB2 -> SUPERSCRIPT TWO
+    '\xb3'     #  0xB3 -> SUPERSCRIPT THREE
+    '\xb4'     #  0xB4 -> ACUTE ACCENT
+    '\xb5'     #  0xB5 -> MICRO SIGN
+    '\xb6'     #  0xB6 -> PILCROW SIGN
+    '\xb7'     #  0xB7 -> MIDDLE DOT
+    '\xb8'     #  0xB8 -> CEDILLA
+    '\xb9'     #  0xB9 -> SUPERSCRIPT ONE
+    '\xba'     #  0xBA -> MASCULINE ORDINAL INDICATOR
+    '\xbb'     #  0xBB -> RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
+    '\xbc'     #  0xBC -> VULGAR FRACTION ONE QUARTER
+    '\xbd'     #  0xBD -> VULGAR FRACTION ONE HALF
+    '\xbe'     #  0xBE -> VULGAR FRACTION THREE QUARTERS
+    '\xbf'     #  0xBF -> INVERTED QUESTION MARK
+    '\xc0'     #  0xC0 -> LATIN CAPITAL LETTER A WITH GRAVE
+    '\xc1'     #  0xC1 -> LATIN CAPITAL LETTER A WITH ACUTE
+    '\xc2'     #  0xC2 -> LATIN CAPITAL LETTER A WITH CIRCUMFLEX
+    '\xc3'     #  0xC3 -> LATIN CAPITAL LETTER A WITH TILDE
+    '\xc4'     #  0xC4 -> LATIN CAPITAL LETTER A WITH DIAERESIS
+    '\xc5'     #  0xC5 -> LATIN CAPITAL LETTER A WITH RING ABOVE
+    '\xc6'     #  0xC6 -> LATIN CAPITAL LETTER AE
+    '\xc7'     #  0xC7 -> LATIN CAPITAL LETTER C WITH CEDILLA
+    '\xc8'     #  0xC8 -> LATIN CAPITAL LETTER E WITH GRAVE
+    '\xc9'     #  0xC9 -> LATIN CAPITAL LETTER E WITH ACUTE
+    '\xca'     #  0xCA -> LATIN CAPITAL LETTER E WITH CIRCUMFLEX
+    '\xcb'     #  0xCB -> LATIN CAPITAL LETTER E WITH DIAERESIS
+    '\xcc'     #  0xCC -> LATIN CAPITAL LETTER I WITH GRAVE
+    '\xcd'     #  0xCD -> LATIN CAPITAL LETTER I WITH ACUTE
+    '\xce'     #  0xCE -> LATIN CAPITAL LETTER I WITH CIRCUMFLEX
+    '\xcf'     #  0xCF -> LATIN CAPITAL LETTER I WITH DIAERESIS
+    '\xd0'     #  0xD0 -> LATIN CAPITAL LETTER ETH (Icelandic)
+    '\xd1'     #  0xD1 -> LATIN CAPITAL LETTER N WITH TILDE
+    '\xd2'     #  0xD2 -> LATIN CAPITAL LETTER O WITH GRAVE
+    '\xd3'     #  0xD3 -> LATIN CAPITAL LETTER O WITH ACUTE
+    '\xd4'     #  0xD4 -> LATIN CAPITAL LETTER O WITH CIRCUMFLEX
+    '\xd5'     #  0xD5 -> LATIN CAPITAL LETTER O WITH TILDE
+    '\xd6'     #  0xD6 -> LATIN CAPITAL LETTER O WITH DIAERESIS
+    '\xd7'     #  0xD7 -> MULTIPLICATION SIGN
+    '\xd8'     #  0xD8 -> LATIN CAPITAL LETTER O WITH STROKE
+    '\xd9'     #  0xD9 -> LATIN CAPITAL LETTER U WITH GRAVE
+    '\xda'     #  0xDA -> LATIN CAPITAL LETTER U WITH ACUTE
+    '\xdb'     #  0xDB -> LATIN CAPITAL LETTER U WITH CIRCUMFLEX
+    '\xdc'     #  0xDC -> LATIN CAPITAL LETTER U WITH DIAERESIS
+    '\xdd'     #  0xDD -> LATIN CAPITAL LETTER Y WITH ACUTE
+    '\xde'     #  0xDE -> LATIN CAPITAL LETTER THORN (Icelandic)
+    '\xdf'     #  0xDF -> LATIN SMALL LETTER SHARP S (German)
+    '\xe0'     #  0xE0 -> LATIN SMALL LETTER A WITH GRAVE
+    '\xe1'     #  0xE1 -> LATIN SMALL LETTER A WITH ACUTE
+    '\xe2'     #  0xE2 -> LATIN SMALL LETTER A WITH CIRCUMFLEX
+    '\xe3'     #  0xE3 -> LATIN SMALL LETTER A WITH TILDE
+    '\xe4'     #  0xE4 -> LATIN SMALL LETTER A WITH DIAERESIS
+    '\xe5'     #  0xE5 -> LATIN SMALL LETTER A WITH RING ABOVE
+    '\xe6'     #  0xE6 -> LATIN SMALL LETTER AE
+    '\xe7'     #  0xE7 -> LATIN SMALL LETTER C WITH CEDILLA
+    '\xe8'     #  0xE8 -> LATIN SMALL LETTER E WITH GRAVE
+    '\xe9'     #  0xE9 -> LATIN SMALL LETTER E WITH ACUTE
+    '\xea'     #  0xEA -> LATIN SMALL LETTER E WITH CIRCUMFLEX
+    '\xeb'     #  0xEB -> LATIN SMALL LETTER E WITH DIAERESIS
+    '\xec'     #  0xEC -> LATIN SMALL LETTER I WITH GRAVE
+    '\xed'     #  0xED -> LATIN SMALL LETTER I WITH ACUTE
+    '\xee'     #  0xEE -> LATIN SMALL LETTER I WITH CIRCUMFLEX
+    '\xef'     #  0xEF -> LATIN SMALL LETTER I WITH DIAERESIS
+    '\xf0'     #  0xF0 -> LATIN SMALL LETTER ETH (Icelandic)
+    '\xf1'     #  0xF1 -> LATIN SMALL LETTER N WITH TILDE
+    '\xf2'     #  0xF2 -> LATIN SMALL LETTER O WITH GRAVE
+    '\xf3'     #  0xF3 -> LATIN SMALL LETTER O WITH ACUTE
+    '\xf4'     #  0xF4 -> LATIN SMALL LETTER O WITH CIRCUMFLEX
+    '\xf5'     #  0xF5 -> LATIN SMALL LETTER O WITH TILDE
+    '\xf6'     #  0xF6 -> LATIN SMALL LETTER O WITH DIAERESIS
+    '\xf7'     #  0xF7 -> DIVISION SIGN
+    '\xf8'     #  0xF8 -> LATIN SMALL LETTER O WITH STROKE
+    '\xf9'     #  0xF9 -> LATIN SMALL LETTER U WITH GRAVE
+    '\xfa'     #  0xFA -> LATIN SMALL LETTER U WITH ACUTE
+    '\xfb'     #  0xFB -> LATIN SMALL LETTER U WITH CIRCUMFLEX
+    '\xfc'     #  0xFC -> LATIN SMALL LETTER U WITH DIAERESIS
+    '\xfd'     #  0xFD -> LATIN SMALL LETTER Y WITH ACUTE
+    '\xfe'     #  0xFE -> LATIN SMALL LETTER THORN (Icelandic)
+    '\xff'     #  0xFF -> LATIN SMALL LETTER Y WITH DIAERESIS
+)
 
-### Encoding Map
+### Encoding table
+encoding_table=codecs.charmap_build(decoding_table)
 
-encoding_map = codecs.make_encoding_map(decoding_map)

File Lib/encodings/ptcp154.py

 class Codec(codecs.Codec):
 
     def encode(self,input,errors='strict'):
-        return codecs.charmap_encode(input,errors,encoding_map)
+        return codecs.charmap_encode(input,errors,encoding_table)
 
     def decode(self,input,errors='strict'):
-        return codecs.charmap_decode(input,errors,decoding_map)
+        return codecs.charmap_decode(input,errors,decoding_table)
 
 class IncrementalEncoder(codecs.IncrementalEncoder):
     def encode(self, input, final=False):
-        return codecs.charmap_encode(input,self.errors,encoding_map)[0]
+        return codecs.charmap_encode(input,self.errors,encoding_table)[0]
 
 class IncrementalDecoder(codecs.IncrementalDecoder):
     def decode(self, input, final=False):
-        return codecs.charmap_decode(input,self.errors,decoding_map)[0]
+        return codecs.charmap_decode(input,self.errors,decoding_table)[0]
 
 class StreamWriter(Codec,codecs.StreamWriter):
     pass
         streamwriter=StreamWriter,
     )
 
-### Decoding Map
 
-decoding_map = codecs.make_identity_dict(range(256))
-decoding_map.update({
-        0x0080: 0x0496, #        CYRILLIC CAPITAL LETTER ZHE WITH DESCENDER
-        0x0081: 0x0492, #        CYRILLIC CAPITAL LETTER GHE WITH STROKE
-        0x0082: 0x04ee, #        CYRILLIC CAPITAL LETTER U WITH MACRON
-        0x0083: 0x0493, #        CYRILLIC SMALL LETTER GHE WITH STROKE
-        0x0084: 0x201e, #        DOUBLE LOW-9 QUOTATION MARK
-        0x0085: 0x2026, #        HORIZONTAL ELLIPSIS
-        0x0086: 0x04b6, #        CYRILLIC CAPITAL LETTER CHE WITH DESCENDER
-        0x0087: 0x04ae, #        CYRILLIC CAPITAL LETTER STRAIGHT U
-        0x0088: 0x04b2, #        CYRILLIC CAPITAL LETTER HA WITH DESCENDER
-        0x0089: 0x04af, #        CYRILLIC SMALL LETTER STRAIGHT U
-        0x008a: 0x04a0, #        CYRILLIC CAPITAL LETTER BASHKIR KA
-        0x008b: 0x04e2, #        CYRILLIC CAPITAL LETTER I WITH MACRON
-        0x008c: 0x04a2, #        CYRILLIC CAPITAL LETTER EN WITH DESCENDER
-        0x008d: 0x049a, #        CYRILLIC CAPITAL LETTER KA WITH DESCENDER
-        0x008e: 0x04ba, #        CYRILLIC CAPITAL LETTER SHHA
-        0x008f: 0x04b8, #        CYRILLIC CAPITAL LETTER CHE WITH VERTICAL STROKE
-        0x0090: 0x0497, #        CYRILLIC SMALL LETTER ZHE WITH DESCENDER
-        0x0091: 0x2018, #        LEFT SINGLE QUOTATION MARK
-        0x0092: 0x2019, #        RIGHT SINGLE QUOTATION MARK
-        0x0093: 0x201c, #        LEFT DOUBLE QUOTATION MARK
-        0x0094: 0x201d, #        RIGHT DOUBLE QUOTATION MARK
-        0x0095: 0x2022, #        BULLET
-        0x0096: 0x2013, #        EN DASH
-        0x0097: 0x2014, #        EM DASH
-        0x0098: 0x04b3, #        CYRILLIC SMALL LETTER HA WITH DESCENDER
-        0x0099: 0x04b7, #        CYRILLIC SMALL LETTER CHE WITH DESCENDER
-        0x009a: 0x04a1, #        CYRILLIC SMALL LETTER BASHKIR KA
-        0x009b: 0x04e3, #        CYRILLIC SMALL LETTER I WITH MACRON
-        0x009c: 0x04a3, #        CYRILLIC SMALL LETTER EN WITH DESCENDER
-        0x009d: 0x049b, #        CYRILLIC SMALL LETTER KA WITH DESCENDER
-        0x009e: 0x04bb, #        CYRILLIC SMALL LETTER SHHA
-        0x009f: 0x04b9, #        CYRILLIC SMALL LETTER CHE WITH VERTICAL STROKE
-        0x00a1: 0x040e, #        CYRILLIC CAPITAL LETTER SHORT U (Byelorussian)
-        0x00a2: 0x045e, #        CYRILLIC SMALL LETTER SHORT U (Byelorussian)
-        0x00a3: 0x0408, #        CYRILLIC CAPITAL LETTER JE
-        0x00a4: 0x04e8, #        CYRILLIC CAPITAL LETTER BARRED O
-        0x00a5: 0x0498, #        CYRILLIC CAPITAL LETTER ZE WITH DESCENDER
-        0x00a6: 0x04b0, #        CYRILLIC CAPITAL LETTER STRAIGHT U WITH STROKE
-        0x00a8: 0x0401, #        CYRILLIC CAPITAL LETTER IO
-        0x00aa: 0x04d8, #        CYRILLIC CAPITAL LETTER SCHWA
-        0x00ad: 0x04ef, #        CYRILLIC SMALL LETTER U WITH MACRON
-        0x00af: 0x049c, #        CYRILLIC CAPITAL LETTER KA WITH VERTICAL STROKE
-        0x00b1: 0x04b1, #        CYRILLIC SMALL LETTER STRAIGHT U WITH STROKE
-        0x00b2: 0x0406, #        CYRILLIC CAPITAL LETTER BYELORUSSIAN-UKRAINIAN I
-        0x00b3: 0x0456, #        CYRILLIC SMALL LETTER BYELORUSSIAN-UKRAINIAN I
-        0x00b4: 0x0499, #        CYRILLIC SMALL LETTER ZE WITH DESCENDER
-        0x00b5: 0x04e9, #        CYRILLIC SMALL LETTER BARRED O
-        0x00b8: 0x0451, #        CYRILLIC SMALL LETTER IO
-        0x00b9: 0x2116, #        NUMERO SIGN
-        0x00ba: 0x04d9, #        CYRILLIC SMALL LETTER SCHWA
-        0x00bc: 0x0458, #        CYRILLIC SMALL LETTER JE
-        0x00bd: 0x04aa, #        CYRILLIC CAPITAL LETTER ES WITH DESCENDER
-        0x00be: 0x04ab, #        CYRILLIC SMALL LETTER ES WITH DESCENDER
-        0x00bf: 0x049d, #        CYRILLIC SMALL LETTER KA WITH VERTICAL STROKE
-        0x00c0: 0x0410, #        CYRILLIC CAPITAL LETTER A
-        0x00c1: 0x0411, #        CYRILLIC CAPITAL LETTER BE
-        0x00c2: 0x0412, #        CYRILLIC CAPITAL LETTER VE
-        0x00c3: 0x0413, #        CYRILLIC CAPITAL LETTER GHE
-        0x00c4: 0x0414, #        CYRILLIC CAPITAL LETTER DE
-        0x00c5: 0x0415, #        CYRILLIC CAPITAL LETTER IE
-        0x00c6: 0x0416, #        CYRILLIC CAPITAL LETTER ZHE
-        0x00c7: 0x0417, #        CYRILLIC CAPITAL LETTER ZE
-        0x00c8: 0x0418, #        CYRILLIC CAPITAL LETTER I
-        0x00c9: 0x0419, #        CYRILLIC CAPITAL LETTER SHORT I
-        0x00ca: 0x041a, #        CYRILLIC CAPITAL LETTER KA
-        0x00cb: 0x041b, #        CYRILLIC CAPITAL LETTER EL
-        0x00cc: 0x041c, #        CYRILLIC CAPITAL LETTER EM
-        0x00cd: 0x041d, #        CYRILLIC CAPITAL LETTER EN
-        0x00ce: 0x041e, #        CYRILLIC CAPITAL LETTER O
-        0x00cf: 0x041f, #        CYRILLIC CAPITAL LETTER PE
-        0x00d0: 0x0420, #        CYRILLIC CAPITAL LETTER ER
-        0x00d1: 0x0421, #        CYRILLIC CAPITAL LETTER ES
-        0x00d2: 0x0422, #        CYRILLIC CAPITAL LETTER TE
-        0x00d3: 0x0423, #        CYRILLIC CAPITAL LETTER U
-        0x00d4: 0x0424, #        CYRILLIC CAPITAL LETTER EF
-        0x00d5: 0x0425, #        CYRILLIC CAPITAL LETTER HA
-        0x00d6: 0x0426, #        CYRILLIC CAPITAL LETTER TSE
-        0x00d7: 0x0427, #        CYRILLIC CAPITAL LETTER CHE
-        0x00d8: 0x0428, #        CYRILLIC CAPITAL LETTER SHA
-        0x00d9: 0x0429, #        CYRILLIC CAPITAL LETTER SHCHA
-        0x00da: 0x042a, #        CYRILLIC CAPITAL LETTER HARD SIGN
-        0x00db: 0x042b, #        CYRILLIC CAPITAL LETTER YERU
-        0x00dc: 0x042c, #        CYRILLIC CAPITAL LETTER SOFT SIGN
-        0x00dd: 0x042d, #        CYRILLIC CAPITAL LETTER E
-        0x00de: 0x042e, #        CYRILLIC CAPITAL LETTER YU
-        0x00df: 0x042f, #        CYRILLIC CAPITAL LETTER YA
-        0x00e0: 0x0430, #        CYRILLIC SMALL LETTER A
-        0x00e1: 0x0431, #        CYRILLIC SMALL LETTER BE
-        0x00e2: 0x0432, #        CYRILLIC SMALL LETTER VE
-        0x00e3: 0x0433, #        CYRILLIC SMALL LETTER GHE
-        0x00e4: 0x0434, #        CYRILLIC SMALL LETTER DE
-        0x00e5: 0x0435, #        CYRILLIC SMALL LETTER IE
-        0x00e6: 0x0436, #        CYRILLIC SMALL LETTER ZHE
-        0x00e7: 0x0437, #        CYRILLIC SMALL LETTER ZE
-        0x00e8: 0x0438, #        CYRILLIC SMALL LETTER I
-        0x00e9: 0x0439, #        CYRILLIC SMALL LETTER SHORT I
-        0x00ea: 0x043a, #        CYRILLIC SMALL LETTER KA
-        0x00eb: 0x043b, #        CYRILLIC SMALL LETTER EL
-        0x00ec: 0x043c, #        CYRILLIC SMALL LETTER EM
-        0x00ed: 0x043d, #        CYRILLIC SMALL LETTER EN
-        0x00ee: 0x043e, #        CYRILLIC SMALL LETTER O
-        0x00ef: 0x043f, #        CYRILLIC SMALL LETTER PE
-        0x00f0: 0x0440, #        CYRILLIC SMALL LETTER ER
-        0x00f1: 0x0441, #        CYRILLIC SMALL LETTER ES
-        0x00f2: 0x0442, #        CYRILLIC SMALL LETTER TE
-        0x00f3: 0x0443, #        CYRILLIC SMALL LETTER U
-        0x00f4: 0x0444, #        CYRILLIC SMALL LETTER EF
-        0x00f5: 0x0445, #        CYRILLIC SMALL LETTER HA
-        0x00f6: 0x0446, #        CYRILLIC SMALL LETTER TSE
-        0x00f7: 0x0447, #        CYRILLIC SMALL LETTER CHE
-        0x00f8: 0x0448, #        CYRILLIC SMALL LETTER SHA
-        0x00f9: 0x0449, #        CYRILLIC SMALL LETTER SHCHA
-        0x00fa: 0x044a, #        CYRILLIC SMALL LETTER HARD SIGN
-        0x00fb: 0x044b, #        CYRILLIC SMALL LETTER YERU
-        0x00fc: 0x044c, #        CYRILLIC SMALL LETTER SOFT SIGN
-        0x00fd: 0x044d, #        CYRILLIC SMALL LETTER E
-        0x00fe: 0x044e, #        CYRILLIC SMALL LETTER YU
-        0x00ff: 0x044f, #        CYRILLIC SMALL LETTER YA
-})
+### Decoding Table
 
-### Encoding Map
+decoding_table = (
+    '\x00'     #  0x00 -> NULL
+    '\x01'     #  0x01 -> START OF HEADING
+    '\x02'     #  0x02 -> START OF TEXT
+    '\x03'     #  0x03 -> END OF TEXT
+    '\x04'     #  0x04 -> END OF TRANSMISSION
+    '\x05'     #  0x05 -> ENQUIRY
+    '\x06'     #  0x06 -> ACKNOWLEDGE
+    '\x07'     #  0x07 -> BELL
+    '\x08'     #  0x08 -> BACKSPACE
+    '\t'       #  0x09 -> HORIZONTAL TABULATION
+    '\n'       #  0x0A -> LINE FEED
+    '\x0b'     #  0x0B -> VERTICAL TABULATION
+    '\x0c'     #  0x0C -> FORM FEED
+    '\r'       #  0x0D -> CARRIAGE RETURN
+    '\x0e'     #  0x0E -> SHIFT OUT
+    '\x0f'     #  0x0F -> SHIFT IN
+    '\x10'     #  0x10 -> DATA LINK ESCAPE
+    '\x11'     #  0x11 -> DEVICE CONTROL ONE
+    '\x12'     #  0x12 -> DEVICE CONTROL TWO
+    '\x13'     #  0x13 -> DEVICE CONTROL THREE
+    '\x14'     #  0x14 -> DEVICE CONTROL FOUR
+    '\x15'     #  0x15 -> NEGATIVE ACKNOWLEDGE
+    '\x16'     #  0x16 -> SYNCHRONOUS IDLE
+    '\x17'     #  0x17 -> END OF TRANSMISSION BLOCK
+    '\x18'     #  0x18 -> CANCEL
+    '\x19'     #  0x19 -> END OF MEDIUM
+    '\x1a'     #  0x1A -> SUBSTITUTE
+    '\x1b'     #  0x1B -> ESCAPE
+    '\x1c'     #  0x1C -> FILE SEPARATOR
+    '\x1d'     #  0x1D -> GROUP SEPARATOR
+    '\x1e'     #  0x1E -> RECORD SEPARATOR
+    '\x1f'     #  0x1F -> UNIT SEPARATOR
+    ' '        #  0x20 -> SPACE
+    '!'        #  0x21 -> EXCLAMATION MARK
+    '"'        #  0x22 -> QUOTATION MARK
+    '#'        #  0x23 -> NUMBER SIGN
+    '$'        #  0x24 -> DOLLAR SIGN
+    '%'        #  0x25 -> PERCENT SIGN
+    '&'        #  0x26 -> AMPERSAND
+    "'"        #  0x27 -> APOSTROPHE
+    '('        #  0x28 -> LEFT PARENTHESIS
+    ')'        #  0x29 -> RIGHT PARENTHESIS
+    '*'        #  0x2A -> ASTERISK
+    '+'        #  0x2B -> PLUS SIGN
+    ','        #  0x2C -> COMMA
+    '-'        #  0x2D -> HYPHEN-MINUS
+    '.'        #  0x2E -> FULL STOP
+    '/'        #  0x2F -> SOLIDUS
+    '0'        #  0x30 -> DIGIT ZERO
+    '1'        #  0x31 -> DIGIT ONE
+    '2'        #  0x32 -> DIGIT TWO
+    '3'        #  0x33 -> DIGIT THREE
+    '4'        #  0x34 -> DIGIT FOUR
+    '5'        #  0x35 -> DIGIT FIVE
+    '6'        #  0x36 -> DIGIT SIX
+    '7'        #  0x37 -> DIGIT SEVEN
+    '8'        #  0x38 -> DIGIT EIGHT
+    '9'        #  0x39 -> DIGIT NINE
+    ':'        #  0x3A -> COLON
+    ';'        #  0x3B -> SEMICOLON
+    '<'        #  0x3C -> LESS-THAN SIGN
+    '='        #  0x3D -> EQUALS SIGN
+    '>'        #  0x3E -> GREATER-THAN SIGN
+    '?'        #  0x3F -> QUESTION MARK
+    '@'        #  0x40 -> COMMERCIAL AT
+    'A'        #  0x41 -> LATIN CAPITAL LETTER A
+    'B'        #  0x42 -> LATIN CAPITAL LETTER B
+    'C'        #  0x43 -> LATIN CAPITAL LETTER C
+    'D'        #  0x44 -> LATIN CAPITAL LETTER D
+    'E'        #  0x45 -> LATIN CAPITAL LETTER E
+    'F'        #  0x46 -> LATIN CAPITAL LETTER F
+    'G'        #  0x47 -> LATIN CAPITAL LETTER G
+    'H'        #  0x48 -> LATIN CAPITAL LETTER H
+    'I'        #  0x49 -> LATIN CAPITAL LETTER I
+    'J'        #  0x4A -> LATIN CAPITAL LETTER J
+    'K'        #  0x4B -> LATIN CAPITAL LETTER K
+    'L'        #  0x4C -> LATIN CAPITAL LETTER L
+    'M'        #  0x4D -> LATIN CAPITAL LETTER M
+    'N'        #  0x4E -> LATIN CAPITAL LETTER N
+    'O'        #  0x4F -> LATIN CAPITAL LETTER O
+    'P'        #  0x50 -> LATIN CAPITAL LETTER P
+    'Q'        #  0x51 -> LATIN CAPITAL LETTER Q
+    'R'        #  0x52 -> LATIN CAPITAL LETTER R
+    'S'        #  0x53 -> LATIN CAPITAL LETTER S
+    'T'        #  0x54 -> LATIN CAPITAL LETTER T
+    'U'        #  0x55 -> LATIN CAPITAL LETTER U
+    'V'        #  0x56 -> LATIN CAPITAL LETTER V
+    'W'        #  0x57 -> LATIN CAPITAL LETTER W
+    'X'        #  0x58 -> LATIN CAPITAL LETTER X
+    'Y'        #  0x59 -> LATIN CAPITAL LETTER Y
+    'Z'        #  0x5A -> LATIN CAPITAL LETTER Z
+    '['        #  0x5B -> LEFT SQUARE BRACKET
+    '\\'       #  0x5C -> REVERSE SOLIDUS
+    ']'        #  0x5D -> RIGHT SQUARE BRACKET
+    '^'        #  0x5E -> CIRCUMFLEX ACCENT
+    '_'        #  0x5F -> LOW LINE
+    '`'        #  0x60 -> GRAVE ACCENT
+    'a'        #  0x61 -> LATIN SMALL LETTER A
+    'b'        #  0x62 -> LATIN SMALL LETTER B
+    'c'        #  0x63 -> LATIN SMALL LETTER C
+    'd'        #  0x64 -> LATIN SMALL LETTER D
+    'e'        #  0x65 -> LATIN SMALL LETTER E
+    'f'        #  0x66 -> LATIN SMALL LETTER F
+    'g'        #  0x67 -> LATIN SMALL LETTER G
+    'h'        #  0x68 -> LATIN SMALL LETTER H
+    'i'        #  0x69 -> LATIN SMALL LETTER I
+    'j'        #  0x6A -> LATIN SMALL LETTER J
+    'k'        #  0x6B -> LATIN SMALL LETTER K
+    'l'        #  0x6C -> LATIN SMALL LETTER L
+    'm'        #  0x6D -> LATIN SMALL LETTER M
+    'n'        #  0x6E -> LATIN SMALL LETTER N
+    'o'        #  0x6F -> LATIN SMALL LETTER O
+    'p'        #  0x70 -> LATIN SMALL LETTER P
+    'q'        #  0x71 -> LATIN SMALL LETTER Q
+    'r'        #  0x72 -> LATIN SMALL LETTER R
+    's'        #  0x73 -> LATIN SMALL LETTER S
+    't'        #  0x74 -> LATIN SMALL LETTER T
+    'u'        #  0x75 -> LATIN SMALL LETTER U
+    'v'        #  0x76 -> LATIN SMALL LETTER V
+    'w'        #  0x77 -> LATIN SMALL LETTER W
+    'x'        #  0x78 -> LATIN SMALL LETTER X
+    'y'        #  0x79 -> LATIN SMALL LETTER Y
+    'z'        #  0x7A -> LATIN SMALL LETTER Z
+    '{'        #  0x7B -> LEFT CURLY BRACKET
+    '|'        #  0x7C -> VERTICAL LINE
+    '}'        #  0x7D -> RIGHT CURLY BRACKET
+    '~'        #  0x7E -> TILDE
+    '\x7f'     #  0x7F -> DELETE (DEL)
+    '\u0496'   #  0x80 -> CYRILLIC CAPITAL LETTER ZHE WITH DESCENDER
+    '\u0492'   #  0x81 -> CYRILLIC CAPITAL LETTER GHE WITH STROKE
+    '\u04ee'   #  0x82 -> CYRILLIC CAPITAL LETTER U WITH MACRON
+    '\u0493'   #  0x83 -> CYRILLIC SMALL LETTER GHE WITH STROKE
+    '\u201e'   #  0x84 -> DOUBLE LOW-9 QUOTATION MARK
+    '\u2026'   #  0x85 -> HORIZONTAL ELLIPSIS
+    '\u04b6'   #  0x86 -> CYRILLIC CAPITAL LETTER CHE WITH DESCENDER
+    '\u04ae'   #  0x87 -> CYRILLIC CAPITAL LETTER STRAIGHT U
+    '\u04b2'   #  0x88 -> CYRILLIC CAPITAL LETTER HA WITH DESCENDER
+    '\u04af'   #  0x89 -> CYRILLIC SMALL LETTER STRAIGHT U
+    '\u04a0'   #  0x8A -> CYRILLIC CAPITAL LETTER BASHKIR KA
+    '\u04e2'   #  0x8B -> CYRILLIC CAPITAL LETTER I WITH MACRON
+    '\u04a2'   #  0x8C -> CYRILLIC CAPITAL LETTER EN WITH DESCENDER
+    '\u049a'   #  0x8D -> CYRILLIC CAPITAL LETTER KA WITH DESCENDER
+    '\u04ba'   #  0x8E -> CYRILLIC CAPITAL LETTER SHHA
+    '\u04b8'   #  0x8F -> CYRILLIC CAPITAL LETTER CHE WITH VERTICAL STROKE
+    '\u0497'   #  0x90 -> CYRILLIC SMALL LETTER ZHE WITH DESCENDER
+    '\u2018'   #  0x91 -> LEFT SINGLE QUOTATION MARK
+    '\u2019'   #  0x92 -> RIGHT SINGLE QUOTATION MARK
+    '\u201c'   #  0x93 -> LEFT DOUBLE QUOTATION MARK
+    '\u201d'   #  0x94 -> RIGHT DOUBLE QUOTATION MARK
+    '\u2022'   #  0x95 -> BULLET
+    '\u2013'   #  0x96 -> EN DASH
+    '\u2014'   #  0x97 -> EM DASH
+    '\u04b3'   #  0x98 -> CYRILLIC SMALL LETTER HA WITH DESCENDER
+    '\u04b7'   #  0x99 -> CYRILLIC SMALL LETTER CHE WITH DESCENDER
+    '\u04a1'   #  0x9A -> CYRILLIC SMALL LETTER BASHKIR KA
+    '\u04e3'   #  0x9B -> CYRILLIC SMALL LETTER I WITH MACRON
+    '\u04a3'   #  0x9C -> CYRILLIC SMALL LETTER EN WITH DESCENDER
+    '\u049b'   #  0x9D -> CYRILLIC SMALL LETTER KA WITH DESCENDER
+    '\u04bb'   #  0x9E -> CYRILLIC SMALL LETTER SHHA
+    '\u04b9'   #  0x9F -> CYRILLIC SMALL LETTER CHE WITH VERTICAL STROKE
+    '\xa0'     #  0xA0 -> NO-BREAK SPACE
+    '\u040e'   #  0xA1 -> CYRILLIC CAPITAL LETTER SHORT U (Byelorussian)
+    '\u045e'   #  0xA2 -> CYRILLIC SMALL LETTER SHORT U (Byelorussian)
+    '\u0408'   #  0xA3 -> CYRILLIC CAPITAL LETTER JE
+    '\u04e8'   #  0xA4 -> CYRILLIC CAPITAL LETTER BARRED O
+    '\u0498'   #  0xA5 -> CYRILLIC CAPITAL LETTER ZE WITH DESCENDER
+    '\u04b0'   #  0xA6 -> CYRILLIC CAPITAL LETTER STRAIGHT U WITH STROKE
+    '\xa7'     #  0xA7 -> SECTION SIGN
+    '\u0401'   #  0xA8 -> CYRILLIC CAPITAL LETTER IO
+    '\xa9'     #  0xA9 -> COPYRIGHT SIGN
+    '\u04d8'   #  0xAA -> CYRILLIC CAPITAL LETTER SCHWA
+    '\xab'     #  0xAB -> LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
+    '\xac'     #  0xAC -> NOT SIGN
+    '\u04ef'   #  0xAD -> CYRILLIC SMALL LETTER U WITH MACRON
+    '\xae'     #  0xAE -> REGISTERED SIGN
+    '\u049c'   #  0xAF -> CYRILLIC CAPITAL LETTER KA WITH VERTICAL STROKE
+    '\xb0'     #  0xB0 -> DEGREE SIGN
+    '\u04b1'   #  0xB1 -> CYRILLIC SMALL LETTER STRAIGHT U WITH STROKE
+    '\u0406'   #  0xB2 -> CYRILLIC CAPITAL LETTER BYELORUSSIAN-UKRAINIAN I
+    '\u0456'   #  0xB3 -> CYRILLIC SMALL LETTER BYELORUSSIAN-UKRAINIAN I
+    '\u0499'   #  0xB4 -> CYRILLIC SMALL LETTER ZE WITH DESCENDER
+    '\u04e9'   #  0xB5 -> CYRILLIC SMALL LETTER BARRED O
+    '\xb6'     #  0xB6 -> PILCROW SIGN
+    '\xb7'     #  0xB7 -> MIDDLE DOT
+    '\u0451'   #  0xB8 -> CYRILLIC SMALL LETTER IO
+    '\u2116'   #  0xB9 -> NUMERO SIGN
+    '\u04d9'   #  0xBA -> CYRILLIC SMALL LETTER SCHWA
+    '\xbb'     #  0xBB -> RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
+    '\u0458'   #  0xBC -> CYRILLIC SMALL LETTER JE
+    '\u04aa'   #  0xBD -> CYRILLIC CAPITAL LETTER ES WITH DESCENDER
+    '\u04ab'   #  0xBE -> CYRILLIC SMALL LETTER ES WITH DESCENDER
+    '\u049d'   #  0xBF -> CYRILLIC SMALL LETTER KA WITH VERTICAL STROKE
+    '\u0410'   #  0xC0 -> CYRILLIC CAPITAL LETTER A
+    '\u0411'   #  0xC1 -> CYRILLIC CAPITAL LETTER BE
+    '\u0412'   #  0xC2 -> CYRILLIC CAPITAL LETTER VE
+    '\u0413'   #  0xC3 -> CYRILLIC CAPITAL LETTER GHE
+    '\u0414'   #  0xC4 -> CYRILLIC CAPITAL LETTER DE
+    '\u0415'   #  0xC5 -> CYRILLIC CAPITAL LETTER IE
+    '\u0416'   #  0xC6 -> CYRILLIC CAPITAL LETTER ZHE
+    '\u0417'   #  0xC7 -> CYRILLIC CAPITAL LETTER ZE
+    '\u0418'   #  0xC8 -> CYRILLIC CAPITAL LETTER I
+    '\u0419'   #  0xC9 -> CYRILLIC CAPITAL LETTER SHORT I
+    '\u041a'   #  0xCA -> CYRILLIC CAPITAL LETTER KA
+    '\u041b'   #  0xCB -> CYRILLIC CAPITAL LETTER EL
+    '\u041c'   #  0xCC -> CYRILLIC CAPITAL LETTER EM
+    '\u041d'   #  0xCD -> CYRILLIC CAPITAL LETTER EN
+    '\u041e'   #  0xCE -> CYRILLIC CAPITAL LETTER O
+    '\u041f'   #  0xCF -> CYRILLIC CAPITAL LETTER PE
+    '\u0420'   #  0xD0 -> CYRILLIC CAPITAL LETTER ER
+    '\u0421'   #  0xD1 -> CYRILLIC CAPITAL LETTER ES
+    '\u0422'   #  0xD2 -> CYRILLIC CAPITAL LETTER TE
+    '\u0423'   #  0xD3 -> CYRILLIC CAPITAL LETTER U
+    '\u0424'   #  0xD4 -> CYRILLIC CAPITAL LETTER EF
+    '\u0425'   #  0xD5 -> CYRILLIC CAPITAL LETTER HA
+    '\u0426'   #  0xD6 -> CYRILLIC CAPITAL LETTER TSE
+    '\u0427'   #  0xD7 -> CYRILLIC CAPITAL LETTER CHE
+    '\u0428'   #  0xD8 -> CYRILLIC CAPITAL LETTER SHA
+    '\u0429'   #  0xD9 -> CYRILLIC CAPITAL LETTER SHCHA
+    '\u042a'   #  0xDA -> CYRILLIC CAPITAL LETTER HARD SIGN
+    '\u042b'   #  0xDB -> CYRILLIC CAPITAL LETTER YERU
+    '\u042c'   #  0xDC -> CYRILLIC CAPITAL LETTER SOFT SIGN
+    '\u042d'   #  0xDD -> CYRILLIC CAPITAL LETTER E
+    '\u042e'   #  0xDE -> CYRILLIC CAPITAL LETTER YU
+    '\u042f'   #  0xDF -> CYRILLIC CAPITAL LETTER YA
+    '\u0430'   #  0xE0 -> CYRILLIC SMALL LETTER A
+    '\u0431'   #  0xE1 -> CYRILLIC SMALL LETTER BE
+    '\u0432'   #  0xE2 -> CYRILLIC SMALL LETTER VE
+    '\u0433'   #  0xE3 -> CYRILLIC SMALL LETTER GHE
+    '\u0434'   #  0xE4 -> CYRILLIC SMALL LETTER DE
+    '\u0435'   #  0xE5 -> CYRILLIC SMALL LETTER IE
+    '\u0436'   #  0xE6 -> CYRILLIC SMALL LETTER ZHE
+    '\u0437'   #  0xE7 -> CYRILLIC SMALL LETTER ZE
+    '\u0438'   #  0xE8 -> CYRILLIC SMALL LETTER I
+    '\u0439'   #  0xE9 -> CYRILLIC SMALL LETTER SHORT I
+    '\u043a'   #  0xEA -> CYRILLIC SMALL LETTER KA
+    '\u043b'   #  0xEB -> CYRILLIC SMALL LETTER EL
+    '\u043c'   #  0xEC -> CYRILLIC SMALL LETTER EM
+    '\u043d'   #  0xED -> CYRILLIC SMALL LETTER EN
+    '\u043e'   #  0xEE -> CYRILLIC SMALL LETTER O
+    '\u043f'   #  0xEF -> CYRILLIC SMALL LETTER PE
+    '\u0440'   #  0xF0 -> CYRILLIC SMALL LETTER ER
+    '\u0441'   #  0xF1 -> CYRILLIC SMALL LETTER ES
+    '\u0442'   #  0xF2 -> CYRILLIC SMALL LETTER TE
+    '\u0443'   #  0xF3 -> CYRILLIC SMALL LETTER U
+    '\u0444'   #  0xF4 -> CYRILLIC SMALL LETTER EF
+    '\u0445'   #  0xF5 -> CYRILLIC SMALL LETTER HA
+    '\u0446'   #  0xF6 -> CYRILLIC SMALL LETTER TSE
+    '\u0447'   #  0xF7 -> CYRILLIC SMALL LETTER CHE
+    '\u0448'   #  0xF8 -> CYRILLIC SMALL LETTER SHA
+    '\u0449'   #  0xF9 -> CYRILLIC SMALL LETTER SHCHA
+    '\u044a'   #  0xFA -> CYRILLIC SMALL LETTER HARD SIGN
+    '\u044b'   #  0xFB -> CYRILLIC SMALL LETTER YERU
+    '\u044c'   #  0xFC -> CYRILLIC SMALL LETTER SOFT SIGN
+    '\u044d'   #  0xFD -> CYRILLIC SMALL LETTER E
+    '\u044e'   #  0xFE -> CYRILLIC SMALL LETTER YU
+    '\u044f'   #  0xFF -> CYRILLIC SMALL LETTER YA
+)
 
-encoding_map = codecs.make_encoding_map(decoding_map)
+### Encoding table
+encoding_table=codecs.charmap_build(decoding_table)
 Core and Builtins
 -----------------
 
+- Issue #14874: Restore charmap decoding speed to pre-PEP 393 levels.
+  Patch by Serhiy Storchaka.
+
 - Issue #15026: utf-16 encoding is now significantly faster (up to 10x).
   Patch by Serhiy Storchaka.
 

File Objects/unicodeobject.c

     e = s + size;
     if (PyUnicode_CheckExact(mapping)) {
         Py_ssize_t maplen;
-        enum PyUnicode_Kind kind;
-        void *data;
+        enum PyUnicode_Kind mapkind;
+        void *mapdata;
         Py_UCS4 x;
 
         if (PyUnicode_READY(mapping) == -1)
             return NULL;
 
         maplen = PyUnicode_GET_LENGTH(mapping);
-        data = PyUnicode_DATA(mapping);
-        kind = PyUnicode_KIND(mapping);
+        mapdata = PyUnicode_DATA(mapping);
+        mapkind = PyUnicode_KIND(mapping);
         while (s < e) {
-            unsigned char ch = *s;
+            unsigned char ch;
+            if (mapkind == PyUnicode_2BYTE_KIND && maplen >= 256) {
+                enum PyUnicode_Kind outkind = PyUnicode_KIND(v);
+                if (outkind == PyUnicode_1BYTE_KIND) {
+                    void *outdata = PyUnicode_DATA(v);
+                    Py_UCS4 maxchar = PyUnicode_MAX_CHAR_VALUE(v);
+                    while (s < e) {
+                        unsigned char ch = *s;
+                        x = PyUnicode_READ(PyUnicode_2BYTE_KIND, mapdata, ch);
+                        if (x > maxchar)
+                            goto Error;
+                        PyUnicode_WRITE(PyUnicode_1BYTE_KIND, outdata, outpos++, x);
+                        ++s;
+                    }
+                    break;
+                }
+                else if (outkind == PyUnicode_2BYTE_KIND) {
+                    void *outdata = PyUnicode_DATA(v);
+                    while (s < e) {
+                        unsigned char ch = *s;
+                        x = PyUnicode_READ(PyUnicode_2BYTE_KIND, mapdata, ch);
+                        if (x == 0xFFFE)
+                            goto Error;
+                        PyUnicode_WRITE(PyUnicode_2BYTE_KIND, outdata, outpos++, x);
+                        ++s;
+                    }
+                    break;
+                }
+            }
+            ch = *s;
 
             if (ch < maplen)
-                x = PyUnicode_READ(kind, data, ch);
+                x = PyUnicode_READ(mapkind, mapdata, ch);
             else
                 x = 0xfffe; /* invalid value */
-
+Error:
             if (x == 0xfffe)
             {
                 /* undefined mapping */
     int count2 = 0, count3 = 0;
     int kind;
     void *data;
+    Py_ssize_t length;
     Py_UCS4 ch;
 
-    if (!PyUnicode_Check(string) || PyUnicode_GET_LENGTH(string) != 256) {
+    if (!PyUnicode_Check(string) || !PyUnicode_GET_LENGTH(string)) {
         PyErr_BadArgument();
         return NULL;
     }
     kind = PyUnicode_KIND(string);
     data = PyUnicode_DATA(string);
+    length = PyUnicode_GET_LENGTH(string);
+    length = Py_MIN(length, 256);
     memset(level1, 0xFF, sizeof level1);
     memset(level2, 0xFF, sizeof level2);
 
        a mapping dictionary. */
     if (PyUnicode_READ(kind, data, 0) != 0)
         need_dict = 1;
-    for (i = 1; i < 256; i++) {
+    for (i = 1; i < length; i++) {
         int l1, l2;
         ch = PyUnicode_READ(kind, data, i);
         if (ch == 0 || ch > 0xFFFF) {
         PyObject *key, *value;
         if (!result)
             return NULL;
-        for (i = 0; i < 256; i++) {
+        for (i = 0; i < length; i++) {
             key = PyLong_FromLong(PyUnicode_READ(kind, data, i));
             value = PyLong_FromLong(i);
             if (!key || !value)
     memset(mlevel2, 0xFF, 16*count2);
     memset(mlevel3, 0, 128*count3);
     count3 = 0;
-    for (i = 1; i < 256; i++) {
+    for (i = 1; i < length; i++) {
         int o1, o2, o3, i2, i3;
-        if (PyUnicode_READ(kind, data, i) == 0xFFFE)
+        Py_UCS4 ch = PyUnicode_READ(kind, data, i);
+        if (ch == 0xFFFE)
             /* unmapped character */
             continue;
-        o1 = PyUnicode_READ(kind, data, i)>>11;
-        o2 = (PyUnicode_READ(kind, data, i)>>7) & 0xF;
+        o1 = ch>>11;
+        o2 = (ch>>7) & 0xF;
         i2 = 16*mlevel1[o1] + o2;
         if (mlevel2[i2] == 0xFF)
             mlevel2[i2] = count3++;
-        o3 = PyUnicode_READ(kind, data, i) & 0x7F;
+        o3 = ch & 0x7F;
         i3 = 128*mlevel2[i2] + o3;
         mlevel3[i3] = i;
     }

File Tools/unicode/gencodec.py

             comment = ''
         else:
             comment = comment[1:].strip()
-        if enc < 256:
+        if not isinstance(enc, tuple) and enc < 256:
             if enc in unmapped:
                 unmapped.remove(enc)
             if enc == uni:
     # Analyze map and create table dict
     mappings = sorted(map.items())
     table = {}
-    maxkey = 0
+    maxkey = 255
     if 'IDENTITY' in map:
         for key in range(256):
             table[key] = (key, '')
-        maxkey = 255
         del map['IDENTITY']
     for mapkey, mapvalue in mappings:
         mapcomment = ''
         return None
 
     # Create table code
+    maxchar = 0
     for key in range(maxkey + 1):
         if key not in table:
             mapvalue = MISSING_CODE
                 return None
             else:
                 mapchar = chr(mapvalue)
+        maxchar = max(maxchar, ord(mapchar))
         if mapcomment and comments:
             append('    %a \t#  %s -> %s' % (mapchar,
                                             hexrepr(key, key_precision),
         else:
             append('    %a' % mapchar)
 
+    if maxchar < 256:
+        append('    %a \t## Widen to UCS2 for optimization' % UNI_UNDEFINED)
     append(')')
     return l