[issue20990] pyflakes: undefined names, get_context() and main(), in multiprocessing

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> It looks like multiprocessing.get_context() exists, but I don't see how it
> is defined.

It is defined by:

globals().update((name, getattr(context._default_context, name))
                 for name in context._default_context.__all__)

> For main(), it should maybe be replaced with _main()?

_main() has different signature.

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<http://bugs.python.org/issue20990>
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