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Stripped down, forked version of Pattern package (Web mining module for Python.)

Project description


PyPi version License

This is a fork of the original Pattern package. It is a stripped down version of the original package and contains only the text modules (i.e., pattern.en,,,,,, the vector module and parts of the db module.

Apart from that, it fixes a few problems with the original package:

  • much fewer dependencies: now only requires numpy, scipy and nltk
  • compatible with Python 3.6, 3.7, 3.8
  • properly closes files (no more "ResourceWarning: unclosed file")

The remaining original features are:

  • Natural Language Processing: part-of-speech taggers, n-gram search, sentiment analysis, WordNet
  • Machine Learning: vector space model, clustering, classification (KNN, SVM, Perceptron)

For the original documentation, see


PatternLite supports Python 3.6, 3.7 and 3.8.

If you have pip, you can automatically download and install from the PyPI repository:

pip install PatternLite

To install PatternLite from source, unzip the download and from the command line do:

python install


For documentation and examples see the user documentation. If you are a developer, go check out the developer documentation.




BSD, see LICENSE.txt for further details.


De Smedt, T., Daelemans, W. (2012). Pattern for Python. Journal of Machine Learning Research, 13, 2031–2035.


The source code is hosted on GitHub and contributions or donations are welcomed. Please have look at the developer documentation. If you use Pattern in your work, please cite our reference paper.

Bundled dependencies

Pattern is bundled with the following data sets, algorithms and Python packages:

  • Brill tagger, Eric Brill
  • Brill tagger for Dutch, Jeroen Geertzen
  • Brill tagger for German, Gerold Schneider & Martin Volk
  • Brill tagger for Spanish, trained on Wikicorpus (Samuel Reese & Gemma Boleda et al.)
  • Brill tagger for French, trained on Lefff (Benoît Sagot & Lionel Clément et al.)
  • Brill tagger for Italian, mined from Wiktionary
  • English pluralization, Damian Conway
  • Spanish verb inflection, Fred Jehle
  • French verb inflection, Bob Salita
  • LIBSVM, Chih-Chung Chang & Chih-Jen Lin
  • LIBLINEAR, Rong-En Fan et al.
  • spelling corrector, Peter Norvig



Contributors (chronological):

  • Frederik De Bleser
  • Jason Wiener
  • Daniel Friesen
  • Jeroen Geertzen
  • Thomas Crombez
  • Ken Williams
  • Peteris Erins
  • Rajesh Nair
  • F. De Smedt
  • Radim Řehůřek
  • Tom Loredo
  • John DeBovis
  • Thomas Sileo
  • Gerold Schneider
  • Martin Volk
  • Samuel Joseph
  • Shubhanshu Mishra
  • Robert Elwell
  • Fred Jehle
  • Antoine Mazières +
  • Rémi de Zoeten +
  • Kenneth Koch
  • Jens Grivolla
  • Fabio Marfia
  • Steven Loria
  • Colin Molter +
  • Peter Bull
  • Maurizio Sambati
  • Dan Fu
  • Salvatore Di Dio
  • Vincent Van Asch
  • Frederik Elwert

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