Campbell Barton added the comment:
@r.david.murray, yes, this avoids list creation, but is still quite slow.
To create 1mb of data, you can compare the following:
python -m timeit -s 'from os import urandom' 'print(len(urandom(1000000)))'
python -m timeit -s 'from random import randint'
'print(len(bytes(randint(0, 255) for i in range(1000000))))'
On my system `os.urandom` is 0.04sec, using randint takes 2.24sec (approx 50x
slower).
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<http://bugs.python.org/issue27096>
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