global exception catching

[Mark McEahern]

[Hilbert]
> Is there a way to catch a "global" exception in a python
> program (meaning that if there would be an error
> during execution it could call a function before exiting)?
> 
> I have a program that creates large temp files and in case
> of any unforseen problems I still need to clean up before
> exiting.

Well, for starters, help me understand why this won't work:

#!/usr/bin/env python
# yourprogram.py

def main():

    try:
        dostuff()
    finally:
        cleanup()

if __name__ == '__main__':
    main()
-