[issue15610] PyImport_ImportModuleEx always fails in 3.3 with "ValueError: level must be >= 0"

[Eric Snow]

Eric Snow added the comment:

> Changing the macro's expansion would be good enough IMO.

Sounds good to me.

> PyImport_ImportModuleLevel() is part of the stable API...

>From what I understand, as long as the function header has not changed, the stable ABI is still stable.

> Can't we just drop the check "level < 0"?

In Python 3 a negative value makes no sense, since there are no accommodations for implicit relative imports.  The fact that builtins.__import__() accommodated -1 still was an oversight that was corrected in 3.3.  Looks like this is just one bit that got missed.

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nosy: +eric.snow

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<http://bugs.python.org/issue15610>
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