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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>
diff -purN a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py
--- a/Lib/importlib/_bootstrap.py 2015-02-25 12:27:44.000000000 +0100
+++ b/Lib/importlib/_bootstrap.py 2015-08-27 17:33:26.167191059 +0200
@@ -444,8 +444,6 @@ def cache_from_source(path, debug_overri
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_overri
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])
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