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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Invalid Behaviour When a Default Argument is a Mutable Object","articleBody":"BPO | [4619](https://bugs.python.org/issue4619)\n--- | :---\nNosy | @loewis, @birkenfeld, @tiran\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/birkenfeld'\nclosed_at = \u003cDate 2008-12-10.22:32:29.374\u003e\ncreated_at = \u003cDate 2008-12-10.13:55:36.702\u003e\nlabels = ['type-bug', 'docs']\ntitle = 'Invalid Behaviour When a Default Argument is a Mutable Object'\nupdated_at = \u003cDate 2008-12-10.22:32:29.354\u003e\nuser = 'https://bugs.python.org/rhr'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2008-12-10.22:32:29.354\u003e\nactor = 'loewis'\nassignee = 'georg.brandl'\nclosed = True\nclosed_date = \u003cDate 2008-12-10.22:32:29.374\u003e\ncloser = 'loewis'\ncomponents = ['Documentation']\ncreation = \u003cDate 2008-12-10.13:55:36.702\u003e\ncreator = 'rhr'\ndependencies = []\nfiles = []\nhgrepos = []\nissue_num = 4619\nkeywords = []\nmessage_count = 5.0\nmessages = ['77541', '77542', '77545', '77549', '77573']\nnosy_count = 7.0\nnosy_names = ['loewis', 'georg.brandl', 'christian.heimes', 'gregweb', 'LambertDW', 'Pasha2009', 'rhr']\npr_nums = []\npriority = 'normal'\nresolution = 'wont fix'\nstage = None\nstatus = 'closed'\nsuperseder = None\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue4619'\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/rhr","@type":"Person","name":"rhr"},"datePublished":"2008-12-10T13:55:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/48869/cpython/issues/48869"}