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Then running the module as a script will cause the examples in the
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python M.py

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You can force verbose mode by passing "verbose=True" to testmod, or prohibit
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There are a variety of other ways to run doctests, including integration
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    examples start with a clean slate.

    Optional keyword arg "extraglobs" gives a dictionary that should be
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    Optional keyword arg "verbose" prints lots of stuff if true, prints
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    Optional keyword arg "report" prints a summary at the end when true,
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    detailed, else very brief (in fact, empty if all tests passed).

    Optional keyword arg "optionflags" or's together module constants,
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        DONT_ACCEPT_TRUE_FOR_1
        DONT_ACCEPT_BLANKLINE
        NORMALIZE_WHITESPACE
        ELLIPSIS
        SKIP
        IGNORE_EXCEPTION_DETAIL
        REPORT_UDIFF
        REPORT_CDIFF
        REPORT_NDIFF
        REPORT_ONLY_FIRST_FAILURE

    Optional keyword arg "raise_on_error" raises an exception on the
    first unexpected exception or failure. This allows failures to be
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    Optional keyword arg "parser" specifies a DocTestParser (or
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    Advanced tomfoolery:  testmod runs methods of a local instance of
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             >>> test = DocTestParser().get_doctest('>>> raise KeyError\n42',
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             >>> try:
             ...     case.debug()
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           The UnexpectedException contains the test, the example, and
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             >>> exc_info = failure.exc_info
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             Traceback (most recent call last):
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           If the output doesn't match, then a DocTestFailure is raised:

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             >>> case = DocTestCase(test)

             >>> try:
             ...    case.debug()
             ... except DocTestFailure as f:
             ...    failure = f

           DocTestFailure objects provide access to the test:

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      A Python package or the name of a Python package whose directory
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       #     Python has super accurate integer addition
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