Python 3 has str.casefold(). Python 2 doesn't. py2casefold
brings casefolding support to Python 2.
pip install py2casefold
>>> from py2casefold import casefold >>> print casefold(u"tschüß") tschüss >>> casefold(u"ΣίσυφοςfiÆ") == casefold(u"ΣΊΣΥΦΟσFIæ") == u"σίσυφοσfiæ" True
Note that casefold does not normalize the string. Casefolding and
normalization are different operations. For more info see
http://www.w3.org/International/wiki/Case_folding, and
http://www.w3.org/TR/charmod-norm/.
If you are looking for string similarity you will also probably want to
consider one of the unicode normalization options (NFC, NFKC, NFD, NFKD)
that are available with Python's built in unicodedata.normalize().
At the moment, this pure Python casefold implementation is
significantly (> 20x) slower than the optimized py3 C implementation.
This can be improved later, but it is currently more than sufficient
for basic case folding. As a rough estimate, case folding 100
characters clocks in at ~25μs on an old developer laptop.
To run the tests on all supported Python version simple use tox.
tox
You will need to have Python 2.7, Python 3.4, Python 3.5 and Python 3.6 installed.
BSD and the Unicode license agreement. This module includes data from the Unicode consortium which should include the appropriate notice (see http://unicode.org/copyright.html).
See LICENSE file for details.