> Hi. I created the issue #27266 "Add block keyword-only optional parameter
> to os.urandom()" which is compromise between all proposed solutions and
> should fix *all* urandom issues ;-)
> 
> * os.urandom() remains secure by default, as asked by our security experts
> * Python startup (hash secret) and "import random" don't block anymore
> 
> Happy?

Probably not.

What is the default value of the "block" parameter?

If called with block=False on FreeBSD, where /dev/urandom may block sometimes, what does the function do?