Keep a python script running after browser window closed

[sophie_newbie]

Hi,

I have a cgi script that performs a very long computation that can
take several hours to complete. Is there any smart way that I can keep
this script running until it is finished (after the user has closed
the browser) and email them with the results. The email bit isn't the
problem, I just don't know how to keep the code running in the
background. I'm sure there is a smart way to do this...

Thanks!