[issue29877] compileall hangs when accessing urandom even if number of workers is 1

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

I am not sure PR 4856 is enhancement or bugfix.
But I think it's worth enough to backport to 3.6 and 3.7.
It caused a real UX problem.

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nosy: +inada.naoki

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<https://bugs.python.org/issue29877>
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