Donald Stufft added the comment:

> It's just that the manpage for urandom (and in fact the comments in the 
> source code for /dev/random and /dev/urandom) both recommend using 
> /dev/random for these long-lived cryptographic keys. 

It's a hedge because of the bad behavior of /dev/urandom on early boot in a 
situation where it's highly unlikely that the randomly blocking behavior of 
/dev/random is going to matter.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27297>
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