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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Type cache is not correctly invalidated on a class defining mro()","articleBody":"BPO | [28866](https://bugs.python.org/issue28866)\n--- | :---\nNosy | @terryjreedy, @vstinner, @encukou, @markshannon, @serhiy-storchaka, @Vgr255, @JulienPalard, @miss-islington\nPRs | \u003cli\u003epython/cpython#13117\u003c/li\u003e\u003cli\u003epython/cpython#13157\u003c/li\u003e\u003cli\u003epython/cpython#13589\u003c/li\u003e\u003cli\u003epython/cpython#17573\u003c/li\u003e\nFiles | \u003cli\u003e[weird.py](https://bugs.python.org/file45752/weird.py \"Uploaded as text/plain at 2016-12-04.14:35:45 by sjpalt\"): Steps to reproduce\u003c/li\u003e\u003cli\u003e[weird_without_interactive.py](https://bugs.python.org/file45756/weird_without_interactive.py \"Uploaded as text/plain at 2016-12-04.21:34:53 by @JulienPalard\")\u003c/li\u003e\u003cli\u003e[issue28866.diff](https://bugs.python.org/file45766/issue28866.diff \"Uploaded as text/plain at 2016-12-05.21:59:04 by @JulienPalard\")\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 = None\ncreated_at = \u003cDate 2016-12-04.14:35:45.681\u003e\nlabels = ['interpreter-core', '3.7', 'type-crash']\ntitle = 'Type cache is not correctly invalidated on a class defining mro()'\nupdated_at = \u003cDate 2019-12-11.12:36:42.450\u003e\nuser = 'https://bugs.python.org/sjpalt'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2019-12-11.12:36:42.450\u003e\nactor = 'petr.viktorin'\nassignee = 'none'\nclosed = False\nclosed_date = None\ncloser = None\ncomponents = ['Interpreter Core']\ncreation = \u003cDate 2016-12-04.14:35:45.681\u003e\ncreator = 'sjpalt'\ndependencies = []\nfiles = ['45752', '45756', '45766']\nhgrepos = []\nissue_num = 28866\nkeywords = ['patch']\nmessage_count = 22.0\nmessages = ['282344', '282345', '282349', '282353', '282368', '282375', '282430', '282468', '282485', '282486', '282598', '288072', '341581', '343550', '343581', '343582', '343583', '343585', '343650', '355377', '358257', '358258']\nnosy_count = 9.0\nnosy_names = ['terry.reedy', 'vstinner', 'petr.viktorin', 'Mark.Shannon', 'serhiy.storchaka', 'abarry', 'mdk', 'sjpalt', 'miss-islington']\npr_nums = ['13117', '13157', '13589', '17573']\npriority = 'high'\nresolution = None\nstage = 'patch review'\nstatus = 'open'\nsuperseder = None\ntype = 'crash'\nurl = 'https://bugs.python.org/issue28866'\nversions = ['Python 2.7', 'Python 3.5', 'Python 3.6', 'Python 3.7']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/sjpalt","@type":"Person","name":"sjpalt"},"datePublished":"2016-12-04T14:35:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":22},"url":"https://github.com/73052/cpython/issues/73052"}