Message 384730 - Python tracker

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In-reply-to
Author	pombredanne
Recipients	X-Istence, a.badger, barry, christian.heimes, dhess, l0nwlf, martin.panter, maxking, pitrou, pombredanne, r.david.murray, sascha_silbe, siona, sivert, steve.dower, terry.reedy, wichert, wodny
Date	2021年01月09日.15:22:28
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1610205749.4.0.880904129747.issue4963@roundup.psfhosted.org>

Content
The changes introduced by this ticket in https://github.com/python/cpython/commit/9fc720e5e4f772598013ea48a3f0d22b2b6b04fa#r45794801 are problematic. I discovered this from having tests failing when testing on Python 3.7 and up The bug is that calling mimetypes.init(files) will NOT use my files, but instead use both my files and knownfiles. This was not the case before as knownfiles would be ignored as expected when I provide my of files list. This is a breaking API change IMHO and introduces a buggy unstability : even if I want to ignore knownfiles by providing my list of of files, knownfiles will always be added and this results in erratic and buggy behaviour as the content of "knownfiles" is completely random based on the OS version and else. The code I am using is here https://github.com/nexB/typecode/blob/ba07c04d23441d3469dc5de911376d408514ebd8/src/typecode/contenttype.py#L308 I think we should reopen to fix (or create a new ticket)

Content

The changes introduced by this ticket in https://github.com/python/cpython/commit/9fc720e5e4f772598013ea48a3f0d22b2b6b04fa#r45794801 are problematic.
I discovered this from having tests failing when testing on Python 3.7 and up
The bug is that calling mimetypes.init(files) will NOT use my files, but instead use both my files and knownfiles.
This was not the case before as knownfiles would be ignored as expected when I provide my of files list.
This is a breaking API change IMHO and introduces a buggy unstability : even if I want to ignore knownfiles by providing my list of of files, knownfiles will always be added and this results in erratic and buggy behaviour as the content of "knownfiles" is completely random based on the OS version and else. 
The code I am using is here https://github.com/nexB/typecode/blob/ba07c04d23441d3469dc5de911376d408514ebd8/src/typecode/contenttype.py#L308
I think we should reopen to fix (or create a new ticket)

History
Date	User	Action	Args
2021年01月09日 15:22:29	pombredanne	set	recipients: + pombredanne, barry, terry.reedy, pitrou, christian.heimes, wichert, a.badger, r.david.murray, siona, sascha_silbe, l0nwlf, X-Istence, martin.panter, steve.dower, wodny, maxking, sivert, dhess
2021年01月09日 15:22:29	pombredanne	set	messageid: <1610205749.4.0.880904129747.issue4963@roundup.psfhosted.org>
2021年01月09日 15:22:29	pombredanne	link	issue4963 messages
2021年01月09日 15:22:28	pombredanne	create

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