Stefan Krah added the comment:

Wow, it's by design:

" os.urandom(n)

    Return a string of n random bytes suitable for cryptographic use."


``man urandom'':

"A read from the /dev/urandom device will not block waiting for more entropy.  
As a result,  if  there  is
       not sufficient entropy in the entropy pool, the returned values are 
theoretically vulnerable to a crypto-
       graphic attack on the algorithms used by the driver."

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