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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"mimetypes.guess_extension result changes after mimetypes.init()","articleBody":"BPO | [4963](https://bugs.python.org/issue4963)\n--- | :---\nNosy | @warsaw, @terryjreedy, @pitrou, @tiran, @abadger, @bitdancer, @bertjwregeer, @vadmium, @zooba, @maxking, @pombredanne, @davidkhess\nPRs | \u003cli>python/cpython#3062\u003c/li>\u003cli>python/cpython#14375\u003c/li>\u003cli>python/cpython#14376\u003c/li>\nFiles | \u003cli>[mimetypes-init-test.patch](https://bugs.python.org/file17803/mimetypes-init-test.patch \"Uploaded as text/plain at 2010-06-29.19:04:00 by @bitdancer\")\u003c/li>\u003cli>[issue4963.patch](https://bugs.python.org/file34821/issue4963.patch \"Uploaded as text/plain at 2014-04-14.16:08:16 by @abadger\"): stable guess_extension patch and test\u003c/li>\n\n\u003csup>*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup>\n\n\u003cdetails>\u003csummary>Show more details\u003c/summary>\u003cp>\n\nGitHub fields:\n```python\nassignee = 'https://github.com/zooba'\nclosed_at = \u003cDate 2019-06-25.16:14:49.543>\ncreated_at = \u003cDate 2009-01-16.12:04:54.057>\nlabels = ['easy', 'type-bug', '3.8', 'expert-email', '3.7', 'library', '3.9']\ntitle = 'mimetypes.guess_extension result changes after mimetypes.init()'\nupdated_at = \u003cDate 2021-01-10.02:17:07.465>\nuser = 'https://bugs.python.org/siona'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2021-01-10.02:17:07.465>\nactor = 'terry.reedy'\nassignee = 'steve.dower'\nclosed = True\nclosed_date = \u003cDate 2019-06-25.16:14:49.543>\ncloser = 'steve.dower'\ncomponents = ['Library (Lib)', 'email']\ncreation = \u003cDate 2009-01-16.12:04:54.057>\ncreator = 'siona'\ndependencies = []\nfiles = ['17803', '34821']\nhgrepos = []\nissue_num = 4963\nkeywords = ['patch', 'easy']\nmessage_count = 35.0\nmessages = ['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']\nnosy_count = 18.0\nnosy_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']\npr_nums = ['3062', '14375', '14376']\npriority = 'normal'\nresolution = 'fixed'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = None\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue4963'\nversions = ['Python 3.7', 'Python 3.8', 'Python 3.9']\n```\n\n\u003c/p>\u003c/details>\n","author":{"url":null,"@type":"Person","name":"siona"},"datePublished":"2009-01-16T12:04:54Z","url":"https://github.com/python/cpython/issues/49213"}