'python3 crashed, has been reported' at login

[Peter Gueckel]

Every so often, with no regularity, I get a message at login stating that python3 has
crashed and that it has been reported. My question is:

Should I log out and back in to get a session with a working python3 or does python3
restart automatically after a crash? Am I losing functionality by not logging out and back
in? If it doesn't restart automatically, can I restart it manually, so that I
don't need to log out and back in?