1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
From 1153f503a38daf6388021575f1ad6ce8b702911b Mon Sep 17 00:00:00 2001
From: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
Date: Wed, 23 Dec 2015 11:46:14 +0100
Subject: [PATCH] Add importlib fix for PEP 3147 issue
Python 3 has a new standard for installing .pyc file, called PEP
3147. Unfortunately, this standard requires both the .py and .pyc
files to be installed for a Python module to be found. This is quite
annoying on space-constrained embedded systems, since the .py file is
technically not required for execution.
This patch changes cache_from_source() and source_from_cache() in
importlib to get rid of the "__pycache__" directory.
This effectively disables PEP 3147 for:
* The python standard library
* Packages built with distutils or setuptools
* Packages built with automake that use the `py-compile` helper
Signed-off-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
---
Lib/importlib/_bootstrap.py | 26 +++++---------------------
1 file changed, 5 insertions(+), 21 deletions(-)
diff --git a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py
index 5b91c05..a1755ec 100644
--- a/Lib/importlib/_bootstrap.py
+++ b/Lib/importlib/_bootstrap.py
@@ -444,8 +444,6 @@ def cache_from_source(path, debug_override=None):
If debug_override is not None, then it must be a boolean and is used in
place of sys.flags.optimize.
- If sys.implementation.cache_tag is None then NotImplementedError is raised.
-
"""
debug = not sys.flags.optimize if debug_override is None else debug_override
if debug:
@@ -454,33 +452,19 @@ def cache_from_source(path, debug_override=None):
suffixes = OPTIMIZED_BYTECODE_SUFFIXES
head, tail = _path_split(path)
base, sep, rest = tail.rpartition('.')
- tag = sys.implementation.cache_tag
- if tag is None:
- raise NotImplementedError('sys.implementation.cache_tag is None')
- filename = ''.join([(base if base else rest), sep, tag, suffixes[0]])
- return _path_join(head, _PYCACHE, filename)
+ filename = ''.join([(base if base else rest), suffixes[0]])
+ return _path_join(head, filename)
def source_from_cache(path):
"""Given the path to a .pyc./.pyo file, return the path to its .py file.
The .pyc/.pyo file does not need to exist; this simply returns the path to
- the .py file calculated to correspond to the .pyc/.pyo file. If path does
- not conform to PEP 3147 format, ValueError will be raised. If
- sys.implementation.cache_tag is None then NotImplementedError is raised.
+ the .py file calculated to correspond to the .pyc/.pyo file.
"""
- if sys.implementation.cache_tag is None:
- raise NotImplementedError('sys.implementation.cache_tag is None')
- head, pycache_filename = _path_split(path)
- head, pycache = _path_split(head)
- if pycache != _PYCACHE:
- raise ValueError('{} not bottom-level directory in '
- '{!r}'.format(_PYCACHE, path))
- if pycache_filename.count('.') != 2:
- raise ValueError('expected only 2 dots in '
- '{!r}'.format(pycache_filename))
- base_filename = pycache_filename.partition('.')[0]
+ head, filename = _path_split(path)
+ base_filename = filename.partition('.')[0]
return _path_join(head, base_filename + SOURCE_SUFFIXES[0])
--
2.6.4
|
