Donald Stufft added the comment:

Thanks for weighing in Theodore, I think that matches what Colm's last 
suggestion was, and what I was personally OK with. To seed our SipHash function 
using GRND_NONBLOCK since it's likely that will be fine, and worst case we're 
just using it for some hash tables.

Then for our os.urandom binding, we should use getrandom() without 
GRND_NONBLOCK since we don't know why someone is calling os.urandom, but we 
know in practice people are using it for cryptographic keys and the like.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26839>
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