Donald Stufft added the comment:

Looking at random.SystemRandom it appears it would suffer from the same FD 
exhaustion problem.

So as of right now afaik none of the sources of cryptographically secure random 
in the python stdlib offer a way to open a persistent FD. The primary question 
on my mind is if os.urandom can't be modified to maintain a persistent FD can 
Python offer a urandom class that *will* maintain a persistent FD?

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18756>
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