[issue21305] PEP 466: update os.urandom

[STINNER Victor]

STINNER Victor added the comment:

Please don't backport this "feature". We had to wait 20 years before someone requested the feature, but only a few months before the first user reported an issue ("regression"?).

IMO it would be much better to use explicitly a random.SystemRandom instance which would keep the fd open, and only use it if you hit the bug (*many* threads calling os.urandom in parallel.

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nosy: +haypo

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