[Import-SIG] PEP 420 issue: extend_path

martin at v.loewis.de martin at v.loewis.de
Tue May 8 08:40:57 CEST 2012

>> In any case, do note that returning something else than either a loader
>> or None already breaks the API, AFAICT. Existing code calling
>> find_module() will have to be adapted... Which is perhaps worse than
>> the perceived migration problem in PEP 382.
> 382 would have had the same problem.

No, it wouldn't. In PEP 382, find_module is left unmodified. Instead,
find_package_portion can optionally be implemented by finders.

So existing callers continue to work fine - they just won't find package
portions. Existing finders continue to work fine as long as they properly
give an AttributeError when someone tries to access the find_package_portion


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