Brett Cannon e0d88a173c Issue #14605: Make explicit the entries on sys.path_hooks that used to ...

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.

2012-04-25 20:54:04 -04:00

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