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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[C API] Prepare PyTypeObject structure for a stable ABI: avoid accessing members in the public API","articleBody":"BPO | [40170](https://bugs.python.org/issue40170)\n--- | :---\nNosy | @rhettinger, @ronaldoussoren, @vstinner, @corona10, @miss-islington, @shihai1991, @erlend-aasland\nPRs | \u003cli\u003epython/cpython#19375\u003c/li\u003e\u003cli\u003epython/cpython#19376\u003c/li\u003e\u003cli\u003epython/cpython#19377\u003c/li\u003e\u003cli\u003epython/cpython#19378\u003c/li\u003e\u003cli\u003epython/cpython#19379\u003c/li\u003e\u003cli\u003epython/cpython#19426\u003c/li\u003e\u003cli\u003epython/cpython#19428\u003c/li\u003e\u003cli\u003epython/cpython#19464\u003c/li\u003e\u003cli\u003epython/cpython#19541\u003c/li\u003e\u003cli\u003epython/cpython#21390\u003c/li\u003e\u003cli\u003epython/cpython#21391\u003c/li\u003e\u003cli\u003epython/cpython#22375\u003c/li\u003e\u003cli\u003epython/cpython#23153\u003c/li\u003e\u003cli\u003epython/cpython#23235\u003c/li\u003e\u003cli\u003epython/cpython#23236\u003c/li\u003e\u003cli\u003epython/cpython#24535\u003c/li\u003e\u003cli\u003epython/cpython#24548\u003c/li\u003e\u003cli\u003epython/cpython#24553\u003c/li\u003e\u003cli\u003epython/cpython#24555\u003c/li\u003e\u003cli\u003epython/cpython#29470\u003c/li\u003e\u003cli\u003epython/cpython#29471\u003c/li\u003e\u003cli\u003epython/cpython#29472\u003c/li\u003e\u003cli\u003epython/cpython#30938\u003c/li\u003e\u003cli\u003epython/cpython#30940\u003c/li\u003e\u003cli\u003epython/cpython#30942\u003c/li\u003e\u003cli\u003epython/cpython#30943\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 2022-01-28.14:25:55.330\u003e\ncreated_at = \u003cDate 2020-04-03.11:57:03.054\u003e\nlabels = ['expert-C-API', '3.10']\ntitle = '[C API] Prepare PyTypeObject structure for a stable ABI: avoid accessing members in the public API'\nupdated_at = \u003cDate 2022-01-28.14:25:55.330\u003e\nuser = 'https://github.com/vstinner'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2022-01-28.14:25:55.330\u003e\nactor = 'vstinner'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2022-01-28.14:25:55.330\u003e\ncloser = 'vstinner'\ncomponents = ['C API']\ncreation = \u003cDate 2020-04-03.11:57:03.054\u003e\ncreator = 'vstinner'\ndependencies = []\nfiles = []\nhgrepos = []\nissue_num = 40170\nkeywords = ['patch']\nmessage_count = 59.0\nmessages = ['365689', '365795', '365848', '365850', '365852', '365862', '365863', '365873', '365956', '365960', '365961', '365962', '365964', '365966', '366152', '366155', '366417', '366474', '366494', '366521', '366522', '366529', '372050', '372054', '372056', '373293', '373295', '373298', '373338', '373346', '377372', '380757', '381775', '385176', '387057', '387059', '387092', '387113', '387115', '387129', '387131', '387133', '387140', '387142', '387146', '387177', '405956', '405964', '405966', '411816', '411817', '411818', '411819', '411822', '411824', '411919', '411939', '411998', '411999']\nnosy_count = 7.0\nnosy_names = ['rhettinger', 'ronaldoussoren', 'vstinner', 'corona10', 'miss-islington', 'shihai1991', 'erlendaasland']\npr_nums = ['19375', '19376', '19377', '19378', '19379', '19426', '19428', '19464', '19541', '21390', '21391', '22375', '23153', '23235', '23236', '24535', '24548', '24553', '24555', '29470', '29471', '29472', '30938', '30940', '30942', '30943']\npriority = 'normal'\nresolution = 'fixed'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = None\ntype = None\nurl = 'https://bugs.python.org/issue40170'\nversions = ['Python 3.10']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2020-04-03T11:57:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":59},"url":"https://github.com/84351/cpython/issues/84351"}