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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ContextManager and AsyncContextManager protocols can't be subclassed","articleBody":"BPO | [38008](https://bugs.python.org/issue38008)\n--- | :---\nNosy | @ilevkivskyi, @miss-islington, @jivid\nPRs | \u003cli\u003epython/cpython#15647\u003c/li\u003e\u003cli\u003epython/cpython#16021\u003c/li\u003e\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = \u003cDate 2019-09-12.11:59:49.588\u003e\ncreated_at = \u003cDate 2019-09-02.11:44:10.836\u003e\nlabels = ['3.8', 'type-bug', 'library', '3.9']\ntitle = \"ContextManager and AsyncContextManager protocols can't be subclassed\"\nupdated_at = \u003cDate 2019-09-12.11:59:49.587\u003e\nuser = 'https://github.com/jivid'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2019-09-12.11:59:49.587\u003e\nactor = 'levkivskyi'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2019-09-12.11:59:49.588\u003e\ncloser = 'levkivskyi'\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2019-09-02.11:44:10.836\u003e\ncreator = 'divijrajkumar'\ndependencies = []\nfiles = []\nhgrepos = []\nissue_num = 38008\nkeywords = ['patch']\nmessage_count = 5.0\nmessages = ['350988', '350989', '351000', '352088', '352096']\nnosy_count = 3.0\nnosy_names = ['levkivskyi', 'miss-islington', 'divijrajkumar']\npr_nums = ['15647', '16021']\npriority = 'normal'\nresolution = 'fixed'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = None\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue38008'\nversions = ['Python 3.8', 'Python 3.9']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/jivid","@type":"Person","name":"jivid"},"datePublished":"2019-09-02T11:44:11.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/82189/cpython/issues/82189"}