Python 3.3::

    >>> import sys
    >>> print(sys.exit.__doc__)
    exit([status])

    Exit the interpreter by raising SystemExit(status).
    If the status is omitted or None, it defaults to zero (i.e., success).
    If the status is numeric, it will be used as the system exit status.
    If it is another kind of object, it will be printed and the system
    exit status will be one (i.e., failure).

The sentence "If the status is numeric, it will be used as the system exit status."
is wrong::

    >>> sys.exit(3.33)
    3.33
    $ echo $?
    1


It should be "If the status is an *integer*, it will be used as the system exit status.",
as specified in the SystemExit `doc`.

.. doc: http://docs.python.org/3/library/exceptions.html#SystemExit