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Python bindings for libstemmer - snowball stemming algorithms

PyStemmer provides access to efficient algorithms for calculating a "stemmed" form of a word. This is a form with most of the common morphological endings removed; hopefully representing a common linguistic base form. This is most useful in building search engines and information retrieval software; for example, a search with stemming enabled should be able to find a document containing "cycling" given the query "cycles".

PyStemmer provides algorithms for several (mainly European) languages, by wrapping the libstemmer library from the Snowball project in a Python module.

It also provides access to the classic Porter stemming algorithm for English: although this has been superseded by an improved algorithm, the original algorithm may be of interest to information retrieval researchers wishing to reproduce results of earlier experiments.

Package version:1.1.0+dfsg-1



What is PyStemmer?

  PyStemmer is a Python interface to the stemming algorithms from the Snowball
  project ( A stemming algorithm (or stemmer) is
  a process for removing the commoner morphological and inflexional endings
  from words in English. Its main use is as part of a term normalisation
  process that is usually done w


pystemmer (1.1.0+dfsg-1) unstable; urgency=low

  * Initial release (Closes: #375441)

 -- Stefano Rivera <>  Sun, 14 Mar 2010 16:31:11 +0200


Thu Nov 05 23:44:19 GMT 2009  Richard Boulton <>

	* HACKING: Add a note to avoid me being confused by an out-of-date
	  MANIFEST file again.
	* README: Update note about version of Python I'm using.
	* docs/quickstart.txt: Expect romanian and turkish algorithms to be
	  listed, too.

Thu Nov 05 22:28:52 GMT 2009  Richard Boulton <>

	* docs/qu


Name: PyStemmer

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