A pure Python Levenshtein implementation that's not freaking GPL'd.

Based off the Wikipedia code samples at http://en.wikipedia.org/wiki/Levenshtein_distance.

• Python 2.7.X, Python 3.3+ or PyPy 1.6.0+

Usage is fairly straightforward:

import pylev
distance = pylev.levenshtein('kitten', 'sitting')
assert distance == 3

New BSD.

Setup:

$ git clone https://github.com/toastdriven/pylev.git
$ cd pylev

Running:

$ python -m unittest tests

• https://pypi.org/project/levenshtein/ - GPL
• https://pypi.org/project/python-Levenshtein/ - GPL
• https://pypi.org/project/fuzzywuzzy/ - GPL
• https://pypi.org/project/pylevenshtein/ - GPL
• https://pypi.org/project/leven/ - Unknown license & requires Cython

• v1.5.0

  • Added an alternatives section. Thanks to @graingert for the start!

• v1.4.0

  • Updated for current versions of Python
  • Integrated a better Travis matrix. Thanks to @graingert!
  • Fixed mistaken docs about the assert. Thanks to @adamchainz!
  • Reorganized the package.
  • Blacked all the source code.

• v1.3.0

  • Implemented a considerably faster variants (orders of magnitude).
  • Tested & working on Python 2.7.4, Python 3.3.1 & PyPy 1.9.0.

• v1.2.0

  • Fixed all incorrect spellings of "Levenshtein" (there's no "c" in it).
  • Old methods are aliased for backward-compatibility.

• v1.1.0

  • Implemented a much faster variant (several orders of magnitude).
  • The older variant was renamed to classic_levenschtein.
  • Tested & working on Python 3.3 & PyPy 1.6.0 as well.

• v1.0.2

  • Python packaging is REALLY hard. Including the README this time.

• v1.0.1

  • Python packaging is hard. Including the README this time.

• v1.0.0

  • Initial release, just the naive implementation of Levenshtein.