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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"isinstance is 4x as slow as in 2.5 because the common case raises","articleBody":"BPO | [2303](https://bugs.python.org/issue2303)\n--- | :---\nNosy | @gvanrossum, @theller, @rhettinger, @gpshead\nFiles | \u003cli\u003e[isinst.diff](https://bugs.python.org/file9742/isinst.diff \"Uploaded as text/plain at 2008-03-18.22:25:15 by @rhettinger\"): Patch to short circuit an exact match\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/gvanrossum'\nclosed_at = \u003cDate 2008-07-13.18:38:06.819\u003e\ncreated_at = \u003cDate 2008-03-16.15:45:41.157\u003e\nlabels = ['interpreter-core', 'performance']\ntitle = 'isinstance is 4x as slow as in 2.5 because the common case raises'\nupdated_at = \u003cDate 2008-07-13.18:38:06.813\u003e\nuser = 'https://bugs.python.org/jyasskin'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2008-07-13.18:38:06.813\u003e\nactor = 'gregory.p.smith'\nassignee = 'gvanrossum'\nclosed = True\nclosed_date = \u003cDate 2008-07-13.18:38:06.819\u003e\ncloser = 'gregory.p.smith'\ncomponents = ['Interpreter Core']\ncreation = \u003cDate 2008-03-16.15:45:41.157\u003e\ncreator = 'jyasskin'\ndependencies = []\nfiles = ['9742']\nhgrepos = []\nissue_num = 2303\nkeywords = ['patch']\nmessage_count = 11.0\nmessages = ['63580', '63878', '63935', '63952', '63958', '63986', '63991', '64002', '64844', '69487', '69616']\nnosy_count = 5.0\nnosy_names = ['gvanrossum', 'theller', 'rhettinger', 'gregory.p.smith', 'jyasskin']\npr_nums = []\npriority = 'critical'\nresolution = 'accepted'\nstage = None\nstatus = 'closed'\nsuperseder = None\ntype = 'performance'\nurl = 'https://bugs.python.org/issue2303'\nversions = ['Python 2.6']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/jyasskin","@type":"Person","name":"jyasskin"},"datePublished":"2008-03-16T15:45:41.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/46556/cpython/issues/46556"}