Message1114

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This is not a bug, but expected behaviour. Excerpt from the
CPython docs: 

"exception SystemExit
    This exception is raised by the sys.exit() function.
When it is not handled, the Python interpreter exits; no
stack traceback is printed. If the associated value is a
plain integer, it specifies the system exit status (passed
to C's exit() function); if it is None, the exit status is
zero; if it has another type (such as a string), the
object's value is printed and the exit status is one."