mimetypes.guess_extension result changes after mimetypes.init() #49213
Description
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
assignee = 'https://github.com/zooba'
closed_at = <Date 2019-06-25.16:14:49.543>
created_at = <Date 2009-01-16.12:04:54.057>
labels = ['easy', 'type-bug', '3.8', 'expert-email', '3.7', 'library', '3.9']
title = 'mimetypes.guess_extension result changes after mimetypes.init()'
updated_at = <Date 2021-01-10.02:17:07.465>
user = 'https://bugs.python.org/siona'bugs.python.org fields:
activity = <Date 2021-01-10.02:17:07.465>
actor = 'terry.reedy'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2019-06-25.16:14:49.543>
closer = 'steve.dower'
components = ['Library (Lib)', 'email']
creation = <Date 2009-01-16.12:04:54.057>
creator = 'siona'
dependencies = []
files = ['17803', '34821']
hgrepos = []
issue_num = 4963
keywords = ['patch', 'easy']
message_count = 35.0
messages = ['79955', '79961', '79962', '108650', '108674', '108704', '108707', '108746', '108755', '108853', '108934', '108967', '182465', '214948', '216104', '216764', '246649', '293248', '293249', '293258', '293261', '293262', '293626', '293628', '300092', '315145', '322534', '346456', '346457', '346534', '346537', '346539', '384730', '384731', '384750']
nosy_count = 18.0
nosy_names = ['barry', 'terry.reedy', 'pitrou', 'christian.heimes', 'wichert', 'a.badger', 'r.david.murray', 'siona', 'sascha_silbe', 'l0nwlf', 'X-Istence', 'martin.panter', 'steve.dower', 'wodny', 'maxking', 'pombredanne', 'sivert', 'dhess']
pr_nums = ['3062', '14375', '14376']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue4963'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']