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def _test():
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if __name__ == "__main__":
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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
(why not stderr? because stderr is a lame hack <0.2 wink>), and the final
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 "name" gives the name of the test; by default
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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
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        IGNORE_EXCEPTION_DETAIL
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             ...    failure = f

           DocTestFailure objects provide access to the test:

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