Henry S. Thompson <ht@inf.ed.ac.uk> added the comment: [One year and 2 days later... :-[ Is this fixed in 3.9? If not, the Versions list above should be updated. The failure of lower() to preserve 'alpha-ness' is a serious bug, it causes significant failures in e.g. Turkish NLP, and it's _not_ just a failure of the documentation! Please can we move this to category Unicode and get at least this aspect of the problem fixed? Should I raise a separate issue on isalpha() etc.? ---------- _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue12731> _______________________________________