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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Implementation for PEP 451 (importlib.machinery.ModuleSpec)","articleBody":"BPO | [18864](https://bugs.python.org/issue18864)\n--- | :---\nNosy | @brettcannon, @terryjreedy, @ncoghlan, @larryhastings, @PCManticore, @ericsnowcurrently, @berkerpeksag, @phmc\nDependencies | \u003cli\u003ebpo-19697: Document the possible values for __main__.__spec__\u003c/li\u003e\u003cli\u003ebpo-19700: Update runpy for PEP 451\u003c/li\u003e\u003cli\u003ebpo-19701: Update multiprocessing for PEP 451\u003c/li\u003e\u003cli\u003ebpo-19703: Update pydoc to PEP 451\u003c/li\u003e\u003cli\u003ebpo-19704: Update test.test_threaded_import to PEP 451\u003c/li\u003e\u003cli\u003ebpo-19705: Update test.test_namespace_pkgs to PEP 451\u003c/li\u003e\u003cli\u003ebpo-19706: Check if inspect needs updating for PEP 451\u003c/li\u003e\u003cli\u003ebpo-19707: Check if unittest.mock needs updating for PEP 451\u003c/li\u003e\u003cli\u003ebpo-19708: Check pkgutil for anything missing for PEP 451\u003c/li\u003e\u003cli\u003ebpo-19709: Check pythonrun.c is fully using PEP 451\u003c/li\u003e\u003cli\u003ebpo-19710: Make sure documentation for PEP 451 is finished\u003c/li\u003e\u003cli\u003ebpo-19711: add test for changed portions after reloading a namespace package\u003c/li\u003e\u003cli\u003ebpo-19712: Make sure there are exec_module tests for _LoaderBasics subclasses\u003c/li\u003e\u003cli\u003ebpo-19713: Deprecate various things in importlib thanks to PEP 451\u003c/li\u003e\u003cli\u003ebpo-19714: Add tests for importlib.machinery.WindowsRegistryFinder\u003c/li\u003e\u003cli\u003ebpo-21098: Address remaining PEP 451-related to-do comments.\u003c/li\u003e\u003cli\u003ebpo-21099: Switch applicable importlib tests to use PEP 451 API\u003c/li\u003e\nFiles | \u003cli\u003e[modulespec-initial.diff](https://bugs.python.org/file31959/modulespec-initial.diff \"Uploaded as text/plain at 2013-10-05.05:07:57 by @ericsnowcurrently\")\u003c/li\u003e\u003cli\u003e[import-system-reference.diff](https://bugs.python.org/file32381/import-system-reference.diff \"Uploaded as text/plain at 2013-10-26.21:43:42 by @ericsnowcurrently\")\u003c/li\u003e\u003cli\u003e[modulespec-primary-changes.diff](https://bugs.python.org/file32457/modulespec-primary-changes.diff \"Uploaded as text/plain at 2013-11-01.22:25:54 by @ericsnowcurrently\")\u003c/li\u003e\u003cli\u003e[issue18864-has-location-setter.diff](https://bugs.python.org/file33073/issue18864-has-location-setter.diff \"Uploaded as text/plain at 2013-12-10.03:29:53 by @ericsnowcurrently\")\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/ericsnowcurrently'\nclosed_at = \u003cDate 2016-05-12.14:37:11.280\u003e\ncreated_at = \u003cDate 2013-08-28.06:56:18.238\u003e\nlabels = ['interpreter-core', 'deferred-blocker', 'type-feature', 'library']\ntitle = 'Implementation for PEP 451 (importlib.machinery.ModuleSpec)'\nupdated_at = \u003cDate 2016-05-12.14:37:11.278\u003e\nuser = 'https://github.com/ericsnowcurrently'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2016-05-12.14:37:11.278\u003e\nactor = 'eric.snow'\nassignee = 'eric.snow'\nclosed = True\nclosed_date = \u003cDate 2016-05-12.14:37:11.280\u003e\ncloser = 'eric.snow'\ncomponents = ['Interpreter Core', 'Library (Lib)']\ncreation = \u003cDate 2013-08-28.06:56:18.238\u003e\ncreator = 'eric.snow'\ndependencies = ['19697', '19700', '19701', '19703', '19704', '19705', '19706', '19707', '19708', '19709', '19710', '19711', '19712', '19713', '19714', '21098', '21099']\nfiles = ['31959', '32381', '32457', '33073']\nhgrepos = []\nissue_num = 18864\nkeywords = ['patch']\nmessage_count = 66.0\nmessages = ['196352', '198981', '201210', '201212', '201224', '201244', '201369', '201399', '201604', '201605', '201946', '202456', '202461', '202482', '202483', '202655', '202656', '202657', '202658', '202659', '202660', '202661', '202662', '202663', '202664', '202669', '202672', '202673', '202676', '202681', '202695', '202710', '202711', '202712', '202917', '202918', '203329', '203340', '203411', '203578', '203649', '203800', '203801', '203810', '203811', '203825', '203831', '203835', '203843', '205384', '205520', '205575', '205576', '205769', '205822', '205881', '207509', '207510', '210927', '210957', '215152', '221905', '221932', '222289', '236537', '265408']\nnosy_count = 11.0\nnosy_names = ['brett.cannon', 'terry.reedy', 'ncoghlan', 'larry', 'Arfrever', 'Claudiu.Popa', 'BreamoreBoy', 'python-dev', 'eric.snow', 'berker.peksag', 'pconnell']\npr_nums = []\npriority = 'deferred blocker'\nresolution = 'fixed'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = None\ntype = 'enhancement'\nurl = 'https://bugs.python.org/issue18864'\nversions = ['Python 3.4']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/ericsnowcurrently","@type":"Person","name":"ericsnowcurrently"},"datePublished":"2013-08-28T06:56:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":66},"url":"https://github.com/63064/cpython/issues/63064"}