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Then running the module as a script will cause the examples in the
docstrings to get executed and verified:

python M.py

This won't display anything unless an example fails, in which case the
failing example(s) and the cause(s) of the failure(s) are printed to stdout
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line of output is "Test failed.".

Run it with the -v switch instead:

python M.py -v

and a detailed report of all examples tried is printed to stdout, along
with assorted summaries at the end.

You can force verbose mode by passing "verbose=True" to testmod, or prohibit
it by passing "verbose=False".  In either of those cases, sys.argv is not
examined by testmod.

There are a variety of other ways to run doctests, including integration
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    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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        ELLIPSIS
        SKIP
        IGNORE_EXCEPTION_DETAIL
        REPORT_UDIFF
        REPORT_CDIFF
        REPORT_NDIFF
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    Optional keyword arg "raise_on_error" raises an exception on the
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    Optional keyword arg "parser" specifies a DocTestParser (or
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             >>> try:
             ...     case.debug()
             ... except UnexpectedException as f:
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             >>> try:
             ...    case.debug()
             ... except DocTestFailure as f:
             ...    failure = f

           DocTestFailure objects provide access to the test:

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