[docs] [issue22456] __base__ undocumented

[Guido van Rossum]

Guido van Rossum added the comment:

Raymond is correct. __base__ is closely tied to the C implementation.  I think it might be worth a mention, but with an explicit note that it is CPython-specific.  It is sometimes useful, e.g. when wondering why a certain case of multiple inheritance is rejected.

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<http://bugs.python.org/issue22456>
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