Martin Panter added the comment:

I just got this failure again today. I think I have seen it once or twice 
before. Is the failure actually indicating a problem with Python, or is the 
test just too strict?

It seems that it may be like a test ensuring that a random.randint(1, 100) is 
never equal to 81: the probability of it failing is low, but not close enough 
to zero to rely on it never failing. On the other hand, a test ensuring that a 
512-bit cryptographic hash doesn’t collide might be valid because the 
probability is low enough.

----------
nosy: +martin.panter
versions: +Python 3.7

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26163>
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