Nick Coghlan added the comment:

Favouring __spec__.parent over __package__ will break the documented workaround 
in PEP 366 for enabling explicit relative imports from __main__ even when a 
module is run directly instead of via -m:

    if __name__ == "__main__" and __package__ is None:
        __package__ = "expected.package.name"

It may be that workaround is something we *want* to break (as per 
http://bugs.python.org/issue21762#msg258332 ), but if so, it's at least worthy 
of a porting note in the What's New document.

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