Re-implement parts of imp in pure Python

BPO | [13959](https://bugs.python.org/issue13959)
--- | :---
Nosy | @brettcannon, @birkenfeld, @pitrou, @vstinner, @benjaminp, @merwok, @meadori, @ericsnowcurrently, @berkerpeksag
PRs | <li>python/cpython#4736</li>
Dependencies | <li>bpo-2377: Replace __import__ w/ importlib.__import__</li><li>bpo-14605: Make import machinery explicit</li><li>bpo-14657: Avoid two importlib copies</li><li>bpo-15166: Implement imp.get_tag() using sys.implementation</li><li>bpo-15167: Re-implement imp.get_magic() in pure Python</li>
Files | <li>[imp.diff](https://bugs.python.org/file24846/imp.diff "Uploaded as text/plain at 2012-03-14.20:52:28 by @brettcannon")</li><li>[imp.diff](https://bugs.python.org/file24979/imp.diff "Uploaded as text/plain at 2012-03-21.05:42:31 by @ericsnowcurrently")</li><li>[use_of_imp.txt](https://bugs.python.org/file24980/use_of_imp.txt "Uploaded as text/plain at 2012-03-21.05:43:31 by @ericsnowcurrently"): stdlib modules that use imp (could be refactored to use importlib)</li><li>[imp_find_module.diff](https://bugs.python.org/file25250/imp_find_module.diff "Uploaded as text/plain at 2012-04-17.05:57:45 by @ericsnowcurrently"): sketch of find_module() implementation</li><li>[issue13959_reload.diff](https://bugs.python.org/file25302/issue13959_reload.diff "Uploaded as text/plain at 2012-04-22.07:41:32 by @ericsnowcurrently"): port of _imp.reload() to imp.py</li><li>[issue13959_magic_and_tag.diff](https://bugs.python.org/file25303/issue13959_magic_and_tag.diff "Uploaded as text/plain at 2012-04-22.10:40:21 by @ericsnowcurrently"): one approach to moving the magic and tag code out of import.c</li><li>[explicit_meta_path.diff](https://bugs.python.org/file25308/explicit_meta_path.diff "Uploaded as text/plain at 2012-04-23.04:22:26 by @brettcannon")</li><li>[explicit_path_hooks.diff](https://bugs.python.org/file25309/explicit_path_hooks.diff "Uploaded as text/plain at 2012-04-23.04:22:51 by @brettcannon")</li><li>[issue13959_magic.diff](https://bugs.python.org/file25335/issue13959_magic.diff "Uploaded as text/plain at 2012-04-24.05:38:28 by @ericsnowcurrently"): porting MAGIC to importlib</li><li>[issue13959_tag.diff](https://bugs.python.org/file25336/issue13959_tag.diff "Uploaded as text/plain at 2012-04-24.05:40:09 by @ericsnowcurrently"): porting TAG to importlib</li><li>[imptest.py](https://bugs.python.org/file25834/imptest.py "Uploaded as text/plain at 2012-06-05.18:49:09 by jpe")</li><li>[issue13959_get_tag.diff](https://bugs.python.org/file26058/issue13959_get_tag.diff "Uploaded as text/plain at 2012-06-20.01:47:12 by @ericsnowcurrently"): new TAG implementation using sys.implementation</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/brettcannon'
closed_at = <Date 2012-07-09.20:23:48.007>
created_at = <Date 2012-02-07.00:51:29.679>
labels = ['library', 'release-blocker']
title = 'Re-implement parts of imp in pure Python'
updated_at = <Date 2017-12-06.16:25:57.617>
user = 'https://github.com/brettcannon'
```

bugs.python.org fields:
```python
activity = <Date 2017-12-06.16:25:57.617>
actor = 'vstinner'
assignee = 'brett.cannon'
closed = True
closed_date = <Date 2012-07-09.20:23:48.007>
closer = 'brett.cannon'
components = ['Library (Lib)']
creation = <Date 2012-02-07.00:51:29.679>
creator = 'brett.cannon'
dependencies = ['2377', '14605', '14657', '15166', '15167']
files = ['24846', '24979', '24980', '25250', '25302', '25303', '25308', '25309', '25335', '25336', '25834', '26058']
hgrepos = []
issue_num = 13959
keywords = ['patch']
message_count = 76.0
messages = ['152800', '155790', '156473', '156474', '156475', '156527', '156530', '156964', '158269', '158362', '158364', '158365', '158370', '158371', '158377', '158383', '158398', '158474', '158522', '158531', '158555', '158575', '158593', '158594', '158622', '158628', '158704', '158895', '158908', '158930', '158931', '158939', '158941', '158951', '158955', '158968', '158971', '158985', '158986', '158995', '158998', '158999', '159118', '159119', '159628', '159630', '159631', '159641', '159644', '159757', '159758', '159960', '159962', '159969', '160424', '160433', '160434', '160439', '160493', '160495', '160524', '162276', '162356', '162357', '162364', '162384', '162940', '163212', '163232', '163569', '163798', '164102', '165116', '165120', '165148', '307747']
nosy_count = 12.0
nosy_names = ['brett.cannon', 'georg.brandl', 'jpe', 'pitrou', 'vstinner', 'benjamin.peterson', 'eric.araujo', 'Arfrever', 'meador.inge', 'python-dev', 'eric.snow', 'berker.peksag']
pr_nums = ['4736']
priority = 'release blocker'
resolution = 'fixed'
stage = 'needs patch'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue13959'
versions = ['Python 3.3']
```

</p></details>


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Re-implement parts of imp in pure Python #58167

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BPO	13959
Nosy	@brettcannon, @birkenfeld, @pitrou, @vstinner, @benjaminp, @merwok, @meadori, @ericsnowcurrently, @berkerpeksag
PRs	bpo-32030: pass interp to _PyImport_Init() #4736
Dependencies	bpo-2377: Replace import w/ importlib.import bpo-14605: Make import machinery explicit bpo-14657: Avoid two importlib copies bpo-15166: Implement imp.get_tag() using sys.implementation bpo-15167: Re-implement imp.get_magic() in pure Python
Files	imp.diff imp.diff use_of_imp.txt: stdlib modules that use imp (could be refactored to use importlib) imp_find_module.diff: sketch of find_module() implementation issue13959_reload.diff: port of _imp.reload() to imp.py issue13959_magic_and_tag.diff: one approach to moving the magic and tag code out of import.c explicit_meta_path.diff explicit_path_hooks.diff issue13959_magic.diff: porting MAGIC to importlib issue13959_tag.diff: porting TAG to importlib imptest.py issue13959_get_tag.diff: new TAG implementation using sys.implementation

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Re-implement parts of imp in pure Python #58167

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