[issue25791] Raise an ImportWarning when __spec__.parent/__package__ isn't defined for a relative import

[Antoine Pitrou]

Antoine Pitrou added the comment:

This new warning is introducing difficulties for some Cython-compiled modules: https://github.com/cython/cython/issues/1720

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nosy: +pitrou

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<http://bugs.python.org/issue25791>
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