Tarek Ziadé added the comment:

> If os.urandom() doesn't fail, something else will fail soon after.

the random pool can be exhausted, but this is not "soon after" I think. In 
Linux and Mac OS X, ulimit -n defaults to 512 and 256.

It's very easy to reach that limit if you write a web app that uses this API.

> I agree with Antoine. Exhausting the FDs is not the problem,

Do you suggest that we should not use os.urandom on high load ?

Opening an FD on every call sounds under optimal, I am not seeing any drawback 
not to try to optimize that API.

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<http://bugs.python.org/issue18756>
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