The following code doesn't work after upgrading to 3.0.0:

import snowballstemmer
snowballstemmer.stemmer('porter')

with the following error:

  File "/path/to/venv/lib/python3.13/site-packages/snowballstemmer/__init__.py", line 27, in stemmer
    raise KeyError("Stemming algorithm '%s' not found" % lang)
KeyError: "Stemming algorithm 'porter' not found"

It worked fine with v2.2.0. Tested on Python 3.13 and Python 3.11.

I don't use snowballstemmer directly, but it's used by Sphinx's search functionality: https://github.com/sphinx-doc/sphinx/blob/c4929d026c8d22ba229b39cfc2250a9eb1476282/sphinx/search/en.py#L215

Not sure if this is a compatibility issue between Sphinx's usage of the library or a genuine bug in the v3.0.0 release.

Thanks!