[issue42406] Importing multiprocessing breaks pickle.whichmodule

[E. Paine]

Change by E. Paine <paineelisha at gmail.com>:


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nosy: +davin, pitrou
versions:  -Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42406>
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