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Issue #25791: Raise an ImportWarning when __spec__ or __package__ are

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not defined for a relative import.

This is the start of work to try and clean up import semantics to rely
more on a module's spec than on the myriad attributes that get set on
a module. Thanks to Rose Ames for the patch.
This commit is contained in:
Brett Cannon 2016-01-15 13:33:03 -08:00
parent 43cfd8240c
commit 63b8505281
7 changed files with 381 additions and 315 deletions
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6
Lib/importlib/_bootstrap.py
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@ -1032,8 +1032,14 @@ def _calc___package__(globals):
to represent that its proper value is unknown.
"""
spec = globals.get('__spec__')
if spec is not None:
return spec.parent
package = globals.get('__package__')
if package is None:
_warnings.warn("can't resolve package from __spec__ or __package__, "
"falling back on __name__ and __path__",
ImportWarning, stacklevel=3)
package = globals['__name__']
if '__path__' not in globals:
package = package.rpartition('.')[0]