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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Cannot pickle self-referencing sets","articleBody":"BPO | [9269](https://bugs.python.org/issue9269)\n--- | :---\nNosy | @rhettinger, @jcea, @abalkin, @pitrou, @jackdied, @avassalotti, @merwok, @alex\nSuperseder | \u003cli\u003ebpo-17810: Implement PEP 3154 (pickle protocol 4)\u003c/li\u003e\nFiles | \u003cli\u003e[cycle.py](https://bugs.python.org/file18021/cycle.py \"Uploaded as text/plain at 2010-07-15.23:05:18 by @abalkin\"): Script reproducing the bug\u003c/li\u003e\u003cli\u003e[self_referential-sets.patch](https://bugs.python.org/file26533/self_referential-sets.patch \"Uploaded as text/plain at 2012-07-26.23:57:25 by mstefanro\"): Adds support for self-referential sets\u003c/li\u003e\u003cli\u003e[sets-test.patch](https://bugs.python.org/file26539/sets-test.patch \"Uploaded as text/plain at 2012-07-27.14:26:48 by mstefanro\"): Adds testing of pickling/unpickling sets\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/avassalotti'\nclosed_at = \u003cDate 2013-11-30.05:07:31.220\u003e\ncreated_at = \u003cDate 2010-07-15.23:01:40.612\u003e\nlabels = ['type-feature', 'library']\ntitle = 'Cannot pickle self-referencing sets'\nupdated_at = \u003cDate 2013-11-30.05:07:31.219\u003e\nuser = 'https://github.com/abalkin'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2013-11-30.05:07:31.219\u003e\nactor = 'alexandre.vassalotti'\nassignee = 'alexandre.vassalotti'\nclosed = True\nclosed_date = \u003cDate 2013-11-30.05:07:31.220\u003e\ncloser = 'alexandre.vassalotti'\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2010-07-15.23:01:40.612\u003e\ncreator = 'belopolsky'\ndependencies = []\nfiles = ['18021', '26533', '26539']\nhgrepos = []\nissue_num = 9269\nkeywords = ['patch']\nmessage_count = 11.0\nmessages = ['110397', '110402', '110403', '110407', '110408', '110409', '110410', '110423', '110617', '166530', '166570']\nnosy_count = 13.0\nnosy_names = ['rhettinger', 'jcea', 'belopolsky', 'grubert', 'pitrou', 'jackdied', 'alexandre.vassalotti', 'schmir', 'eric.araujo', 'alex', 'zzzeek', 'bcroq', 'mstefanro']\npr_nums = []\npriority = 'low'\nresolution = 'duplicate'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = '17810'\ntype = 'enhancement'\nurl = 'https://bugs.python.org/issue9269'\nversions = ['Python 3.4']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/abalkin","@type":"Person","name":"abalkin"},"datePublished":"2010-07-15T23:01:41.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/53515/cpython/issues/53515"}