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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Restore isinstance and issubclass speed in 2.6","articleBody":"BPO | [2534](https://bugs.python.org/issue2534)\n--- | :---\nNosy | @warsaw, @theller, @rhettinger, @facundobatista, @gpshead, @pitrou, @devdanzin, @benjaminp, @djc\nPRs | \u003cli\u003epython/cpython#18345\u003c/li\u003e\nDependencies | \u003cli\u003ebpo-2542: PyErr_ExceptionMatches must not fail\u003c/li\u003e\nFiles | \u003cli\u003e[type_instancecheck.diff](https://bugs.python.org/file9924/type_instancecheck.diff \"Uploaded as text/plain at 2008-04-02.09:47:45 by @theller\")\u003c/li\u003e\u003cli\u003e[type_instancecheck-2.diff](https://bugs.python.org/file9927/type_instancecheck-2.diff \"Uploaded as text/plain at 2008-04-02.18:47:15 by @theller\"): Cleaner patch, same functionality\u003c/li\u003e\u003cli\u003e[isinstance3k.patch](https://bugs.python.org/file11256/isinstance3k.patch \"Uploaded as text/plain at 2008-08-25.21:11:23 by @pitrou\")\u003c/li\u003e\u003cli\u003e[isinstance3k-2.patch](https://bugs.python.org/file11257/isinstance3k-2.patch \"Uploaded as text/plain at 2008-08-25.21:42:50 by @pitrou\")\u003c/li\u003e\u003cli\u003e[isinstance26-2.patch](https://bugs.python.org/file11261/isinstance26-2.patch \"Uploaded as text/plain at 2008-08-26.11:27:22 by @pitrou\")\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/pitrou'\nclosed_at = \u003cDate 2008-08-26.22:42:41.300\u003e\ncreated_at = \u003cDate 2008-04-02.09:47:47.244\u003e\nlabels = ['release-blocker', 'performance']\ntitle = 'Restore isinstance and issubclass speed in 2.6'\nupdated_at = \u003cDate 2020-02-04.09:42:29.110\u003e\nuser = 'https://github.com/theller'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2020-02-04.09:42:29.110\u003e\nactor = 'vstinner'\nassignee = 'pitrou'\nclosed = True\nclosed_date = \u003cDate 2008-08-26.22:42:41.300\u003e\ncloser = 'pitrou'\ncomponents = []\ncreation = \u003cDate 2008-04-02.09:47:47.244\u003e\ncreator = 'theller'\ndependencies = ['2542']\nfiles = ['9924', '9927', '11256', '11257', '11261']\nhgrepos = []\nissue_num = 2534\nkeywords = ['patch', 'needs review']\nmessage_count = 16.0\nmessages = ['64842', '64859', '64869', '64870', '64875', '64895', '69617', '70358', '71937', '71951', '71957', '71960', '71975', '71980', '71981', '72001']\nnosy_count = 9.0\nnosy_names = ['barry', 'theller', 'rhettinger', 'facundobatista', 'gregory.p.smith', 'pitrou', 'ajaksu2', 'benjamin.peterson', 'djc']\npr_nums = ['18345']\npriority = 'release blocker'\nresolution = 'fixed'\nstage = None\nstatus = 'closed'\nsuperseder = None\ntype = 'performance'\nurl = 'https://bugs.python.org/issue2534'\nversions = ['Python 2.6', 'Python 3.0']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/theller","@type":"Person","name":"theller"},"datePublished":"2008-04-02T09:47:47.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":16},"url":"https://github.com/46786/cpython/issues/46786"}