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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Python 2.6 can't read sets pickled with Python 3.0","articleBody":"BPO | [3675](https://bugs.python.org/issue3675)\n--- | :---\nNosy | @terryjreedy, @pitrou, @devdanzin, @avassalotti\nSuperseder | \u003cli\u003ebpo-6137: Make pickle generated by Python 3.x compatible with 2.x and vice-versa.\u003c/li\u003e\nFiles | \u003cli\u003e[pickle.diff](https://bugs.python.org/file11293/pickle.diff \"Uploaded as text/plain at 2008-08-28.17:51:41 by @devdanzin\"): Adds a 3.0:2.6 modules mapping and uses that in find_class\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 2009-06-04.01:21:36.799\u003e\ncreated_at = \u003cDate 2008-08-25.12:15:41.707\u003e\nlabels = ['type-bug', 'library']\ntitle = \"Python 2.6 can't read sets pickled with Python 3.0\"\nupdated_at = \u003cDate 2009-06-04.01:21:36.798\u003e\nuser = 'https://bugs.python.org/hagen'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2009-06-04.01:21:36.798\u003e\nactor = 'alexandre.vassalotti'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2009-06-04.01:21:36.799\u003e\ncloser = 'alexandre.vassalotti'\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2008-08-25.12:15:41.707\u003e\ncreator = 'hagen'\ndependencies = []\nfiles = ['11293']\nhgrepos = []\nissue_num = 3675\nkeywords = ['patch']\nmessage_count = 10.0\nmessages = ['71916', '72026', '72096', '72097', '72100', '72164', '72165', '74328', '85299', '88862']\nnosy_count = 6.0\nnosy_names = ['collinwinter', 'terry.reedy', 'pitrou', 'ajaksu2', 'alexandre.vassalotti', 'hagen']\npr_nums = []\npriority = 'critical'\nresolution = 'duplicate'\nstage = None\nstatus = 'closed'\nsuperseder = '6137'\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue3675'\nversions = ['Python 2.6', 'Python 3.0', 'Python 3.1', 'Python 2.7']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/hagen","@type":"Person","name":"hagen"},"datePublished":"2008-08-25T12:15:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/47925/cpython/issues/47925"}