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Issue #14605: Make explicit the entries on sys.path_hooks that used to

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be implicit.

Added a warning for when sys.path_hooks is found to be empty. Also
changed the meaning of None in sys.path_importer_cache to represent
trying sys.path_hooks again (an interpretation of previous semantics).
Also added a warning for when None was found.

The long-term goal is for None in sys.path_importer_cache to represent
the same as imp.NullImporter: no finder found for that sys.path entry.
This commit is contained in:
Brett Cannon 2012-04-25 20:54:04 -04:00
parent 8f79dd5d7c
commit e0d88a173c
9 changed files with 3075 additions and 3206 deletions
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13
Lib/pkgutil.py
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@ -379,18 +379,15 @@ def get_importer(path_item):
for path_hook in sys.path_hooks:
try:
importer = path_hook(path_item)
sys.path_importer_cache.setdefault(path_item, importer)
break
except ImportError:
pass
else:
importer = None
sys.path_importer_cache.setdefault(path_item, importer)
if importer is None:
try:
importer = ImpImporter(path_item)
except ImportError:
importer = None
try:
importer = ImpImporter(path_item)
except ImportError:
importer = None
return importer