[issue3158] Doctest fails to find doctests in extension modules

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

For me, a 'function' is written in Python, a 'builtin' is written in C. 

The fact that it is defined in an extension module is irrelevant, and
depends on the implementation: zlib is an extension module on Unix, but
is linked inside python26.dll on Windows.

maybe inspect.isroutine() is the correct test here.

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nosy: +amaury.forgeotdarc

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