bpo-42133: update parts of the stdlib to fall back to `__spec__.loader` when `__loader__` is missing (#22929)

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Brett Cannon 2020-11-06 18:45:56 -08:00 committed by GitHub
parent 7c01f1540f
commit 825ac38332
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6 changed files with 59 additions and 14 deletions

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@ -186,6 +186,12 @@ by :func:`curses.color_content`, :func:`curses.init_color`,
support is provided by the underlying ncurses library.
(Contributed by Jeffrey Kintscher and Hans Petter Jansson in :issue:`36982`.)
doctest
-------
When a module does not define ``__loader__``, fall back to ``__spec__.loader``.
(Contributed by Brett Cannon in :issue:`42133`.)
encodings
---------
:func:`encodings.normalize_encoding` now ignores non-ASCII characters.
@ -198,6 +204,18 @@ Added the *root_dir* and *dir_fd* parameters in :func:`~glob.glob` and
:func:`~glob.iglob` which allow to specify the root directory for searching.
(Contributed by Serhiy Storchaka in :issue:`38144`.)
inspect
-------
When a module does not define ``__loader__``, fall back to ``__spec__.loader``.
(Contributed by Brett Cannon in :issue:`42133`.)
linecache
---------
When a module does not define ``__loader__``, fall back to ``__spec__.loader``.
(Contributed by Brett Cannon in :issue:`42133`.)
os
--
@ -217,6 +235,12 @@ The :mod:`shelve` module now uses :data:`pickle.DEFAULT_PROTOCOL` by default
instead of :mod:`pickle` protocol ``3`` when creating shelves.
(Contributed by Zackery Spytz in :issue:`34204`.)
site
----
When a module does not define ``__loader__``, fall back to ``__spec__.loader``.
(Contributed by Brett Cannon in :issue:`42133`.)
sys
---

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@ -222,13 +222,17 @@ def _load_testfile(filename, package, module_relative, encoding):
if module_relative:
package = _normalize_module(package, 3)
filename = _module_relative_path(package, filename)
if getattr(package, '__loader__', None) is not None:
if hasattr(package.__loader__, 'get_data'):
file_contents = package.__loader__.get_data(filename)
file_contents = file_contents.decode(encoding)
# get_data() opens files as 'rb', so one must do the equivalent
# conversion as universal newlines would do.
return _newline_convert(file_contents), filename
if (loader := getattr(package, '__loader__', None)) is None:
try:
loader = package.__spec__.loader
except AttributeError:
pass
if hasattr(loader, 'get_data'):
file_contents = loader.get_data(filename)
file_contents = file_contents.decode(encoding)
# get_data() opens files as 'rb', so one must do the equivalent
# conversion as universal newlines would do.
return _newline_convert(file_contents), filename
with open(filename, encoding=encoding) as f:
return f.read(), filename

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@ -707,10 +707,13 @@ def getsourcefile(object):
if os.path.exists(filename):
return filename
# only return a non-existent filename if the module has a PEP 302 loader
if getattr(getmodule(object, filename), '__loader__', None) is not None:
module = getmodule(object, filename)
if getattr(module, '__loader__', None) is not None:
return filename
elif getattr(getattr(module, "__spec__", None), "loader", None) is not None:
return filename
# or it is in the linecache
if filename in linecache.cache:
elif filename in linecache.cache:
return filename
def getabsfile(object, _filename=None):

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@ -165,9 +165,14 @@ def lazycache(filename, module_globals):
if not filename or (filename.startswith('<') and filename.endswith('>')):
return False
# Try for a __loader__, if available
if module_globals and '__loader__' in module_globals:
name = module_globals.get('__name__')
loader = module_globals['__loader__']
if module_globals and '__name__' in module_globals:
name = module_globals['__name__']
if (loader := module_globals.get('__loader__')) is None:
if spec := module_globals.get('__spec__'):
try:
loader = spec.loader
except AttributeError:
pass
get_source = getattr(loader, 'get_source', None)
if name and get_source:

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@ -105,8 +105,15 @@ def makepath(*paths):
def abs_paths():
"""Set all module __file__ and __cached__ attributes to an absolute path"""
for m in set(sys.modules.values()):
if (getattr(getattr(m, '__loader__', None), '__module__', None) not in
('_frozen_importlib', '_frozen_importlib_external')):
loader_module = None
try:
loader_module = m.__loader__.__module__
except AttributeError:
try:
loader_module = m.__spec__.loader.__module__
except AttributeError:
pass
if loader_module not in {'_frozen_importlib', '_frozen_importlib_external'}:
continue # don't mess with a PEP 302-supplied __file__
try:
m.__file__ = os.path.abspath(m.__file__)

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@ -0,0 +1,2 @@
Update various modules in the stdlib to fall back on `__spec__.loader` when
`__loader__` isn't defined on a module.