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    default, no extra globals are used.

    Optional keyword arg "verbose" prints lots of stuff if true, prints
    only failures if false; by default, it's true iff "-v" is in sys.argv.

    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,
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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
    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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    Advanced tomfoolery:  testmod runs methods of a local instance of
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           The DocTestCase provides a debug method that raises
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           exception:

             >>> test = DocTestParser().get_doctest('>>> raise KeyError\n42',
             ...                {}, 'foo', 'foo.py', 0)
             >>> case = DocTestCase(test)
             >>> try:
             ...     case.debug()
             ... except UnexpectedException as f:
             ...     failure = f

           The UnexpectedException contains the test, the example, and
           the original exception:

             >>> failure.test is test
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             >>> exc_info = failure.exc_info
             >>> raise exc_info[1] # Already has the traceback
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           If the output doesn't match, then a DocTestFailure is raised:

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

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

           DocTestFailure objects provide access to the test:

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           As well as to the example:

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      If "module_relative" is True, then the given file paths are
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      If "module_relative" is False, then the given file paths are
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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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       >>> print(script_from_examples(text))
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       #
       #     Python has super accurate integer addition
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