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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"tuple function gives wrong answer when called on list subclass with custom __iter__","articleBody":"BPO | [23757](https://bugs.python.org/issue23757)\n--- | :---\nNosy | @rhettinger, @bitdancer, @serhiy-storchaka\nSuperseder | \u003cli\u003ebpo-10977: Concrete object C API considered harmful to subclasses of builtin types\u003c/li\u003e\nFiles | \u003cli\u003e[listwithiter.py](https://bugs.python.org/file38663/listwithiter.py \"Uploaded as text/plain at 2015-03-24.08:42:28 by David MacIver\"): Reproduction test case\u003c/li\u003e\u003cli\u003e[fix_list_to_tuple.diff](https://bugs.python.org/file39365/fix_list_to_tuple.diff \"Uploaded as text/plain at 2015-05-14.00:24:28 by @rhettinger\"): Patch without the OP's test\u003c/li\u003e\u003cli\u003e[fix_list_to_tuple_2.diff](https://bugs.python.org/file39404/fix_list_to_tuple_2.diff \"Uploaded as text/plain at 2015-05-17.09:50:51 by @serhiy-storchaka\"): + tests\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 = 'https://github.com/rhettinger'\nclosed_at = \u003cDate 2015-05-17.21:47:59.965\u003e\ncreated_at = \u003cDate 2015-03-24.08:42:29.638\u003e\nlabels = ['easy', 'type-bug', 'library']\ntitle = 'tuple function gives wrong answer when called on list subclass with custom __iter__'\nupdated_at = \u003cDate 2015-05-17.21:47:59.964\u003e\nuser = 'https://bugs.python.org/DavidMacIver'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2015-05-17.21:47:59.964\u003e\nactor = 'rhettinger'\nassignee = 'rhettinger'\nclosed = True\nclosed_date = \u003cDate 2015-05-17.21:47:59.965\u003e\ncloser = 'rhettinger'\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2015-03-24.08:42:29.638\u003e\ncreator = 'David MacIver'\ndependencies = []\nfiles = ['38663', '39365', '39404']\nhgrepos = []\nissue_num = 23757\nkeywords = ['patch', 'easy']\nmessage_count = 11.0\nmessages = ['239098', '239138', '239152', '239154', '239161', '243073', '243158', '243159', '243392', '243428', '243429']\nnosy_count = 6.0\nnosy_names = ['rhettinger', 'stub', 'r.david.murray', 'python-dev', 'serhiy.storchaka', 'David MacIver']\npr_nums = []\npriority = 'high'\nresolution = 'fixed'\nstage = 'commit review'\nstatus = 'closed'\nsuperseder = '10977'\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue23757'\nversions = ['Python 2.7', 'Python 3.4', 'Python 3.5']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/DavidMacIver","@type":"Person","name":"DavidMacIver"},"datePublished":"2015-03-24T08:42:30.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/67945/cpython/issues/67945"}