The :mod:`atexit` module defines functions to register and unregister cleanup
functions. Functions thus registered are automatically executed upon normal
+interpreter termination. The order in which the functions are called is not
+defined; if you have cleanup operations that depend on each other, you should
+wrap them in a function and register that one. This keeps :mod:`atexit` simple.
Note: the functions registered via this module are not called when the program
is killed by a signal not handled by Python, when a Python fatal internal error