New submission from Guénaël Muller <in...@inkey-art.net>:
mimetypes.guess_extension and mimetypes.guess_all_extensions doesn't work
correctly with non-lowercase mimetype.
>>> import mimetypes
>>> mimetypes.guess_type('file.pptm')
('application/vnd.ms-powerpoint.presentation.macroEnabled.12', None)
>>> mimetypes.guess_extension("application/vnd.ms
>>> powerpoint.presentation.macroEnabled.12")
>>>
This issue exist because we automatically convert type as lower in
guess_all_extensions, but we do not prevent added type to be lowercase.
----------
messages: 360601
nosy: Inkhey
priority: normal
severity: normal
status: open
title: mimetypes.guess_extension unable to get non-lowercase mimetype
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39441>
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