To expand on my idea of printing a warning, in 3.6 we could add a new Warning exception for this purpose, so you'd have command-line control over the behavior of os.urandom() by specifying -WXXX on your Python command line. For 3.5.2 that's too fancy though -- we can't add a new exception.
-- --Guido van Rossum (python.org/~guido)
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