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[3.7] bpo-33169: Remove values of None from sys.path_importer_cache when invalidating caches (GH-6402) (GH-6403)

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An entry of None in sys.path_importer_cache represents a negative/missing finder for a path, so clearing it out makes sense.
(cherry picked from commit 9e2be60634)
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Brett Cannon 2018-04-06 17:02:18 -07:00 • committed by GitHub
parent 3c193cf8af
commit a09bb87c1e
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7 changed files with 654 additions and 616 deletions
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6
Lib/importlib/_bootstrap_external.py
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@ -1179,8 +1179,10 @@ class PathFinder:
def invalidate_caches(cls):
"""Call the invalidate_caches() method on all path entry finders
stored in sys.path_importer_caches (where implemented)."""
for finder in sys.path_importer_cache.values():
if hasattr(finder, 'invalidate_caches'):
for name, finder in list(sys.path_importer_cache.items()):
if finder is None:
del sys.path_importer_cache[name]
elif hasattr(finder, 'invalidate_caches'):
finder.invalidate_caches()
@classmethod