In the threading module the Thread.daemon documentation says:

"The thread’s daemon flag. This must be set before start() is called,
otherwise RuntimeError is raised.

    The initial value is inherited from the creating thread.

    The entire Python program exits when no alive non-daemon threads are
left."

I think the docs should state Thread.daemon's type (boolean, or integer,
or something else?) and its default value (when you have not set .daemon
in the creating thread.)