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

[STINNER Victor]

STINNER Victor added the comment:

Serhiy suggested (msg214136):

"Lib/multiprocessing/synchronize.py:
Add at the start of the file:
from . import get_context"

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

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

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