exception_and_exit.py

# Code taken from http://codereview.stackexchange.com/a/61539/52090

import sys

exit_codes = [ 
    (ValueError, 10),
    (KeyError,   25)
]

# now you can also use a dictionary here, but
# the ordering is not defined, so if you have a
# superclass and subclass, then your code will sometimes
# if the superclass is matched before subclass!

try:
    raise Some_Exception
except tuple(e[0] for e in exit_codes) as exit_err:
    for exc_class, code in exit_codes:
        if isinstance(exit_err, exc_class):
            sys.exit(code)

    raise