70 lines
3.0 KiB
Diff
70 lines
3.0 KiB
Diff
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Add importlib fix for PEP 3147 issue
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Python 3 has a new standard for installing .pyc file, called PEP
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3147. Unfortunately, this standard requires both the .py and .pyc
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files to be installed for a Python module to be found. This is quite
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annoying on space-constrained embedded systems, since the .py file is
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technically not required for execution.
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This patch changes cache_from_source() and source_from_cache() in
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importlib to get rid of the "__pycache__" directory.
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This effectively disables PEP 3147 for:
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* The python standard library
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* Packages built with distutils or setuptools
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* Packages built with automake that use the `py-compile` helper
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Signed-off-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
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diff -purN a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py
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--- a/Lib/importlib/_bootstrap.py 2015-02-25 12:27:44.000000000 +0100
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+++ b/Lib/importlib/_bootstrap.py 2015-08-27 17:33:26.167191059 +0200
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@@ -444,8 +444,6 @@ def cache_from_source(path, debug_overri
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If debug_override is not None, then it must be a boolean and is used in
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place of sys.flags.optimize.
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- If sys.implementation.cache_tag is None then NotImplementedError is raised.
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-
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"""
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debug = not sys.flags.optimize if debug_override is None else debug_override
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if debug:
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@@ -454,33 +452,19 @@ def cache_from_source(path, debug_overri
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suffixes = OPTIMIZED_BYTECODE_SUFFIXES
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head, tail = _path_split(path)
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base, sep, rest = tail.rpartition('.')
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- tag = sys.implementation.cache_tag
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- if tag is None:
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- raise NotImplementedError('sys.implementation.cache_tag is None')
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- filename = ''.join([(base if base else rest), sep, tag, suffixes[0]])
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- return _path_join(head, _PYCACHE, filename)
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+ filename = ''.join([(base if base else rest), suffixes[0]])
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+ return _path_join(head, filename)
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def source_from_cache(path):
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"""Given the path to a .pyc./.pyo file, return the path to its .py file.
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The .pyc/.pyo file does not need to exist; this simply returns the path to
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- the .py file calculated to correspond to the .pyc/.pyo file. If path does
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- not conform to PEP 3147 format, ValueError will be raised. If
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- sys.implementation.cache_tag is None then NotImplementedError is raised.
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+ the .py file calculated to correspond to the .pyc/.pyo file.
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"""
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- if sys.implementation.cache_tag is None:
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- raise NotImplementedError('sys.implementation.cache_tag is None')
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- head, pycache_filename = _path_split(path)
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- head, pycache = _path_split(head)
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- if pycache != _PYCACHE:
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- raise ValueError('{} not bottom-level directory in '
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- '{!r}'.format(_PYCACHE, path))
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- if pycache_filename.count('.') != 2:
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- raise ValueError('expected only 2 dots in '
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- '{!r}'.format(pycache_filename))
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- base_filename = pycache_filename.partition('.')[0]
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+ head, filename = _path_split(path)
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+ base_filename = filename.partition('.')[0]
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return _path_join(head, base_filename + SOURCE_SUFFIXES[0])
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