Le 19/12/2017 à 15:50, STINNER Victor a écrit :
> 
> Hum, it looks like an "embedded device", likely with no entropy source.

If it does I/O (which it probably does, being used for robotics), it
should certainly be able to extract entropy from the outside world.

If it doesn't, it's an OS implementation issue.

Of course it probably doesn't hurt to import concurrent.futures lazily.
However, people should generally not expect us to never call urandom()
when importing stdlib modules.