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

This won't display anything unless an example fails, in which case the
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line of output is "Test failed.".

Run it with the -v switch instead:

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and a detailed report of all examples tried is printed to stdout, along
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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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    Optional keyword arg "globs" gives a dict to be used as the globals
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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,
    else prints nothing at the end.  In verbose mode, the summary is
    detailed, else very brief (in fact, empty if all tests passed).

    Optional keyword arg "optionflags" or's together module constants,
    and defaults to 0.  Possible values (see the docs for details):

        DONT_ACCEPT_TRUE_FOR_1
        DONT_ACCEPT_BLANKLINE
        NORMALIZE_WHITESPACE
        ELLIPSIS
        SKIP
        IGNORE_EXCEPTION_DETAIL
        REPORT_UDIFF
        REPORT_CDIFF
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    Optional keyword arg "raise_on_error" raises an exception on the
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    post-mortem debugged.

    Optional keyword arg "parser" specifies a DocTestParser (or
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    Optional keyword arg "encoding" specifies an encoding that should
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      Traceback (most recent call last):
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           The UnexpectedException contains the test, the example, and
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           If the output doesn't match, then a DocTestFailure is raised:

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             ...    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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