# fuzzy /

Filename Size Date modified Message
src
test
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Use a temporary character variable instead of modifying the string in place, since we want the original string to be left untouched after the encoding is done. Fixes issue #1.
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Added tag 1.0 for changeset 1e260146ea6d
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#295: implementation of nysiis
2.4 KB
24 B
Forgot MANIFEST.in
3.6 KB
Tweak line length
35 B
normalizing egg names
1.4 KB
Improved setup.py; tell bitbucket our readme is reST

# Fuzzy

Fuzzy is a python library implementing common phonetic algorithms quickly. Typically this is in string similarity exercises, but they're pretty versatile.

It uses C Extensions (via Pyrex) for speed.

The algorithms are:

## Installation

Installation should be easy if you have a C compiler such as gcc. All you should need to do is easy_install/pip install it. If you have Pyrex it will regenerate the C code, otherwise it will use the pre-generated code. Here's a basic installation on a clean virtualenv:

(fuzzy_cean)Kotai:~ chmullig$pip install https://bitbucket.org/yougov/fuzzy/get/1.0.tar.gz Downloading/unpacking https://bitbucket.org/yougov/fuzzy/get/1.0.tar.gz Downloading 1.0.tar.gz Running setup.py egg_info for package from https://bitbucket.org/yougov/fuzzy/get/1.0.tar.gz Installing collected packages: Fuzzy Running setup.py install for Fuzzy building 'fuzzy' extension gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch ppc -arch x86_64 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 -c src/fuzzy.c -o build/temp.macosx-10.6-universal-2.6/src/fuzzy.o gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch ppc -arch x86_64 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 -c src/double_metaphone.c -o build/temp.macosx-10.6-universal-2.6/src/double_metaphone.o gcc-4.2 -Wl,-F. -bundle -undefined dynamic_lookup -arch i386 -arch ppc -arch x86_64 build/temp.macosx-10.6-universal-2.6/src/fuzzy.o build/temp.macosx-10.6-universal-2.6/src/double_metaphone.o -o build/lib.macosx-10.6-universal-2.6/fuzzy.so Successfully installed Fuzzy Cleaning up... (fuzzy_cean)Kotai:~ chmullig$


## Usage

The functions are quite easy to use!

>>> import fuzzy
>>> soundex = fuzzy.Soundex(4)
>>> soundex('fuzzy')
'F200'
>>> dmeta = fuzzy.DMetaphone()
>>> dmeta('fuzzy')
['FS', None]
>>> fuzzy.nysiis('fuzzy')
'FASY'


## Performance

Fuzzy's Double Metaphone was ~10 times faster than the pure python implementation by Andrew Collins in some recent testing. Soundex and NYSIIS should be similarly faster. Using iPython's timeit:

In [3]: timeit soundex('fuzzy')
1000000 loops, best of 3: 326 ns per loop

In [4]: timeit dmeta('fuzzy')
100000 loops, best of 3: 2.18 us per loop

In [5]: timeit fuzzy.nysiis('fuzzy')
100000 loops, best of 3: 13.7 us per loop


## Distance Metrics

We recommend the Python-Levenshtein module for fast, C based string distance/similarity metrics. Among others functions it includes:

In testing it's been several times faster than comparable pure python implementations of those algorithms.

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