I have threaded python script that uses sockets to monitor network ports.

I want to ensure that the socket is closed cleanly in all circumstances. This 
includes if the script is killed or interupted in some other way.

As I understand it signal only works in the main thread, so how can I trap 
interupts in my threaded class and always ensure I close the socket? Using 
KeyboardInterupt does not seem to work.


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