Use sys.excepthook to log uncaught exceptions

uncaught.py

# vim: set expandtab ts=4 sw=4 filetype=python:

import logging
import sys
import traceback

def f():

    return g()

def g():

    return h()

def h():

    return i()

def i():

    1/0

def log_uncaught_exceptions(ex_cls, ex, tb):
    logging.critical(''.join(traceback.format_tb(tb)))
    logging.critical('{0}: {1}'.format(ex_cls, ex))

if __name__ == '__main__':

    sys.excepthook = log_uncaught_exceptions

    logging.basicConfig(level=logging.DEBUG)
    logging.debug('About to do f().')

    f()

    # You will never see this logging statement.
    logging.debug('All finished!')

Play around by commenting out line 29 and see what happens.

If you're running this in a bash terminal, do "echo $?" to see the system error code. Notice that when the script crashes, you will always get error code 1 (remember in Unix-land, zero means success) with or without sys.excepthook.