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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
with the unittest framework, and support for running non-Python text
files containing doctests.  There are also many ways to override parts
of doctest's default behaviors.  See the Library Reference Manual for
details.
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         package.  To ensure os-independence, "filename" should use
         "/" characters to separate path segments, and should not
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      - If "module_relative" is False, then "filename" specifies an
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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 "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
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    Optional keyword arg "raise_on_error" raises an exception on the
    first unexpected exception or failure. This allows failures to be
    post-mortem debugged.

    Optional keyword arg "parser" specifies a DocTestParser (or
    subclass) that should be used to extract tests from the files.

    Optional keyword arg "encoding" specifies an encoding that should
    be used to convert the file to unicode.

    Advanced tomfoolery:  testmod runs methods of a local instance of
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      >>> doctest._unittest_reportflags == (REPORT_NDIFF |
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    Only reporting flags can be set:

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             ...      >>> x
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             ...      ''', {}, 'foo', 'foo.py', 0)
             >>> case = DocTestCase(test)

             >>> try:
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    The `module` argument provides the module to be tested.  The argument
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    If no argument is given, the calling module is used.

    A number of options may be provided as keyword arguments:

    setUp
      A set-up function.  This is called before running the
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      A tear-down function.  This is called after running the
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      If "module_relative" is True, then the given file paths are
      interpreted as os-independent module-relative paths.  By
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      If "module_relative" is False, then the given file paths are
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    package
      A Python package or the name of a Python package whose directory
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    optionflags
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       ...
       ...           Python has super accurate integer addition
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       ...           >>> 2 + 2
       ...           5
       ...
       ...           And very friendly error messages:
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       ...           To Infinity
       ...           And
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       # Here are examples of simple math.
       #
       #     Python has super accurate integer addition
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       # Expected:
       ## 5
       #
       #     And very friendly error messages:
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