itchyny <itchyny.itch...@gmail.com> added the comment:

I noticed another unexpectedeffect of the IGNORECASE flag. It enables some 
non-ascii characters to match against the alphabets.

>>> from datetime import datetime
>>> datetime.strptime("Apr\u0130l", "%B")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.9/_strptime.py", line 568, in _strptime_datetime
    tt, fraction, gmtoff_fraction = _strptime(data_string, format)
  File "/usr/local/lib/python3.9/_strptime.py", line 391, in _strptime
    month = locale_time.f_month.index(found_dict['B'].lower())
ValueError: 'apri̇l' is not in list

I expect time data does not match error. The ASCII flag will disable matching 
unexpected unicode characters.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43295>
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