> I have a set of strings (all letters are capitalized) at utf-8,
That's the problem. If these are really utf-8 encoded byte strings,
then .lower likely won't work. It uses the C library's tolower API,
which works on a byte level, i.e. can't work for multi-byte encodings.
What you need to do is to operate on Unicode strings. I.e. instead
of
s.lower()
do
s.decode("utf-8").lower()
or (if you need byte strings back)
s.decode("utf-8").lower().encode("utf-8")
If you find that you write the latter, I recommend that you redesign
your application. Don't use byte strings to represent text, but use
Unicode strings all the time, except at the system boundary (where
you decode/encode as appropriate).
There are some limitations with Unicode .lower also, but I don't
think they apply to Russian (specifically, SpecialCasing.txt is
not considered).
HTH,
Martin
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