How does ^C work in Python?

[Hal Murray]

I'm thinking about the python version of ntpq.  It needs a way to break out 
of commands that are taking too long.

longjmp basically isn't guaranteed to work in c unless you can guarantee that 
the signal won't happen in the middle of any library routines.  They don't 
list the ones that might not work, only a few that are guaranteed to work.


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