[issue27266] Always use getrandom() in os.random() on Linux and add block=False parameter to os.urandom()

[Larry Hastings]

Larry Hastings added the comment:

First, DO NOT merge this change into 3.5.2 without my explicit permission.

Second, unless you can guarantee you support blocking / non-blocking behavior on all platforms, this is a bad move.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27266>
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