what does "(python)program can exit when only daemonic children remain" mean?

Question

I've seen this many times,but still don't know the exact meaning.So anyone explains it? more specifically:

a. I know that if you set daemon=True the thread will become a daemon thread.But why do we need a daemon thread?

b. what's the meaning of "can exit"?

Duplicate look: http://stackoverflow.com/a/1412230/1107807 or http://stackoverflow.com/a/15086113/1107807 or http://stackoverflow.com/a/4330156/1107807 — Don Question, Mar 16 '13 at 16:02

score 0 · Accepted Answer · answered Mar 16 '13 at 18:05

A daemon thread is a process that gets killed when the parent process exits. If you fork a process without setting its daemon to True, then it will run even if the parent process gets killed/exits. That is why you use daemon.

If you could post an example of code that renders that error message we could be more specific...

what does "(python)program can exit when only daemonic children remain" mean?

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