Implementation for PEP 451 (importlib.machinery.ModuleSpec)

BPO | [18864](https://bugs.python.org/issue18864)
--- | :---
Nosy | @brettcannon, @terryjreedy, @ncoghlan, @larryhastings, @PCManticore, @ericsnowcurrently, @berkerpeksag, @phmc
Dependencies | <li>bpo-19697: Document the possible values for __main__.__spec__</li><li>bpo-19700: Update runpy for PEP 451</li><li>bpo-19701: Update multiprocessing for PEP 451</li><li>bpo-19703: Update pydoc to PEP 451</li><li>bpo-19704: Update test.test_threaded_import to PEP 451</li><li>bpo-19705: Update test.test_namespace_pkgs to PEP 451</li><li>bpo-19706: Check if inspect needs updating for PEP 451</li><li>bpo-19707: Check if unittest.mock needs updating for PEP 451</li><li>bpo-19708: Check pkgutil for anything missing for PEP 451</li><li>bpo-19709: Check pythonrun.c is fully using PEP 451</li><li>bpo-19710: Make sure documentation for PEP 451 is finished</li><li>bpo-19711: add test for changed portions after reloading a namespace package</li><li>bpo-19712: Make sure there are exec_module tests for _LoaderBasics subclasses</li><li>bpo-19713: Deprecate various things in importlib thanks to PEP 451</li><li>bpo-19714: Add tests for importlib.machinery.WindowsRegistryFinder</li><li>bpo-21098: Address remaining PEP 451-related to-do comments.</li><li>bpo-21099: Switch applicable importlib tests to use PEP 451 API</li>
Files | <li>[modulespec-initial.diff](https://bugs.python.org/file31959/modulespec-initial.diff "Uploaded as text/plain at 2013-10-05.05:07:57 by @ericsnowcurrently")</li><li>[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")</li><li>[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")</li><li>[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")</li>

<sup>*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*</sup>

<details><summary>Show more details</summary><p>

GitHub fields:
```python
assignee = 'https://github.com/ericsnowcurrently'
closed_at = <Date 2016-05-12.14:37:11.280>
created_at = <Date 2013-08-28.06:56:18.238>
labels = ['interpreter-core', 'deferred-blocker', 'type-feature', 'library']
title = 'Implementation for PEP 451 (importlib.machinery.ModuleSpec)'
updated_at = <Date 2016-05-12.14:37:11.278>
user = 'https://github.com/ericsnowcurrently'
```

bugs.python.org fields:
```python
activity = <Date 2016-05-12.14:37:11.278>
actor = 'eric.snow'
assignee = 'eric.snow'
closed = True
closed_date = <Date 2016-05-12.14:37:11.280>
closer = 'eric.snow'
components = ['Interpreter Core', 'Library (Lib)']
creation = <Date 2013-08-28.06:56:18.238>
creator = 'eric.snow'
dependencies = ['19697', '19700', '19701', '19703', '19704', '19705', '19706', '19707', '19708', '19709', '19710', '19711', '19712', '19713', '19714', '21098', '21099']
files = ['31959', '32381', '32457', '33073']
hgrepos = []
issue_num = 18864
keywords = ['patch']
message_count = 66.0
messages = ['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']
nosy_count = 11.0
nosy_names = ['brett.cannon', 'terry.reedy', 'ncoghlan', 'larry', 'Arfrever', 'Claudiu.Popa', 'BreamoreBoy', 'python-dev', 'eric.snow', 'berker.peksag', 'pconnell']
pr_nums = []
priority = 'deferred blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue18864'
versions = ['Python 3.4']
```

</p></details>


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Implementation for PEP 451 (importlib.machinery.ModuleSpec) #63064

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BPO	18864
Nosy	@brettcannon, @terryjreedy, @ncoghlan, @larryhastings, @PCManticore, @ericsnowcurrently, @berkerpeksag, @phmc
Dependencies	bpo-19697: Document the possible values for main.spec bpo-19700: Update runpy for PEP 451 bpo-19701: Update multiprocessing for PEP 451 bpo-19703: Update pydoc to PEP 451 bpo-19704: Update test.test_threaded_import to PEP 451 bpo-19705: Update test.test_namespace_pkgs to PEP 451 bpo-19706: Check if inspect needs updating for PEP 451 bpo-19707: Check if unittest.mock needs updating for PEP 451 bpo-19708: Check pkgutil for anything missing for PEP 451 bpo-19709: Check pythonrun.c is fully using PEP 451 bpo-19710: Make sure documentation for PEP 451 is finished bpo-19711: add test for changed portions after reloading a namespace package bpo-19712: Make sure there are exec_module tests for _LoaderBasics subclasses bpo-19713: Deprecate various things in importlib thanks to PEP 451 bpo-19714: Add tests for importlib.machinery.WindowsRegistryFinder bpo-21098: Address remaining PEP 451-related to-do comments. bpo-21099: Switch applicable importlib tests to use PEP 451 API
Files	modulespec-initial.diff import-system-reference.diff modulespec-primary-changes.diff issue18864-has-location-setter.diff

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Implementation for PEP 451 (importlib.machinery.ModuleSpec) #63064

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