Update atexit.py

linux:~> atexit.py
Python is not only a reptile
Exception caught : SystemExit(1) : Request to exit from the interpreter.
Python interpreter is exiting.
exitfunc1: Following is the state of 'context'
('count', 1)
('status', ['SystemExit', 'OK'])
('message', 'Python is also a language')

linux:~> echo $?
1