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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"abc module fails to reject instantiation of some multiply-inheriting classes that fail to implement abstract methods","articleBody":"BPO | [28537](https://bugs.python.org/issue28537)\n--- | :---\nNosy | @aleaxit, @bitdancer, @nathanielmanistaatgoogle\nSuperseder | \u003cli\u003ebpo-5996: abstract class instantiable when subclassing built-in types\u003c/li\u003e\nFiles | \u003cli\u003e[abc_what.py](https://bugs.python.org/file45226/abc_what.py \"Uploaded as text/plain at 2016-10-25.23:42:41 by @nathanielmanistaatgoogle\")\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 2016-10-26.00:44:33.168\u003e\ncreated_at = \u003cDate 2016-10-25.23:42:42.012\u003e\nlabels = ['3.7', 'type-bug', 'library']\ntitle = 'abc module fails to reject instantiation of some multiply-inheriting classes that fail to implement abstract methods'\nupdated_at = \u003cDate 2016-10-26.00:44:33.166\u003e\nuser = 'https://github.com/nathanielmanistaatgoogle'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2016-10-26.00:44:33.166\u003e\nactor = 'r.david.murray'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2016-10-26.00:44:33.168\u003e\ncloser = 'r.david.murray'\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2016-10-25.23:42:42.012\u003e\ncreator = 'Nathaniel Manista'\ndependencies = []\nfiles = ['45226']\nhgrepos = []\nissue_num = 28537\nkeywords = []\nmessage_count = 2.0\nmessages = ['279465', '279473']\nnosy_count = 4.0\nnosy_names = ['aleax', 'r.david.murray', 'cvrebert', 'Nathaniel Manista']\npr_nums = []\npriority = 'normal'\nresolution = 'duplicate'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = '5996'\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue28537'\nversions = ['Python 2.7', 'Python 3.3', 'Python 3.4', 'Python 3.5', 'Python 3.6', 'Python 3.7']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/nathanielmanistaatgoogle","@type":"Person","name":"nathanielmanistaatgoogle"},"datePublished":"2016-10-25T23:42:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/72723/cpython/issues/72723"}