[issue21762] update the import machinery to only use __spec__

[Nick Coghlan]

Nick Coghlan added the comment:

That approach sounds good to me.

The main problem cases I'm aware of are:

__name__:

* reliably wrong in __main__
* the attribute you mess with if you want __qualname__ on functions and classes to be different so that pickle will import them from somewhere else (e.g. a parent package)

__path__:

* used for dynamic package definitions (including namespace package emulation)

__package__:

* AFAIK, mainly useful as a workaround for other people doing "bad things" (TM), like running package submodules directly as __main__ rather than using the -m switch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21762>
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