> For entropy, you should always do whatever the Python os.urandom() call does on the local platform.
Disagreed. If you need entropy, you should use real random numbers. If that isn't waht os.urandom() does on your platform, you should rewrite your platform to make it do that.
If that incurs too much overhead you should talk to your isp, random.org, your local network admin, the person who designed your computer or whatever. But if you need random numbers there is a source for them.
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