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In simplest use, end each module M to be tested with:

def _test():
    import doctest
    doctest.testmod()

if __name__ == "__main__":
    _test()

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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- exc_msg: The exception message generated by the example, if
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- lineno: The line number within the DocTest string containing
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- indent: The example's indentation in the DocTest string.
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- options: A dictionary mapping from option flags to True or
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        # Grab the traceback header.  Different versions of Python have
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        \s* $                # toss trailing whitespace on the header.
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            - To help find the line number of the object within its
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Contained objects whose module does not match `module` are ignored.

If `module` is False, no attempt to find the module will be made.
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The `summarize` method prints a summary of all the test cases that
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>>> runner.summarize(verbose=1)
        4 items passed all tests:
           2 tests in _TestClass
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The aggregated number of tried examples and failed examples is
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        0

The comparison between expected outputs and actual outputs is done
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`compileflags` gives the set of flags that should be used by
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        specified, then it will default to the set of future-import
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If an unexpected exception occurs, an UnexpectedException is raised.
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>>> runner = DebugRunner(verbose=False)
         >>> test = DocTestParser().get_doctest('>>> raise KeyError\n42',
         ...                                    {}, 'foo', 'foo.py', 0)
         >>> try:
         ...     runner.run(test)
         ... except UnexpectedException, failure:
         ...     pass

>>> failure.test is test
         True

>>> failure.example.want
         '42\n'

>>> exc_info = failure.exc_info
         >>> raise exc_info[0], exc_info[1], exc_info[2]
         Traceback (most recent call last):
         ...
         KeyError

We wrap the original exception to give the calling application
       access to the test and example information.

If the output doesn't match, then a DocTestFailure is raised:

>>> test = DocTestParser().get_doctest('''
         ...      >>> x = 1
         ...      >>> x
         ...      2
         ...      ''', {}, 'foo', 'foo.py', 0)

>>> try:
         ...    runner.run(test)
         ... except DocTestFailure, failure:
         ...    pass

DocTestFailure objects provide access to the test:

>>> failure.test is test
         True

As well as to the example:

>>> failure.example.want
         '2\n'

and the actual output:

>>> failure.got
         '1\n'

If a failure or error occurs, the globals are left intact:

>>> del test.globs['__builtins__']
         >>> test.globs
         {'x': 1}

>>> test = DocTestParser().get_doctest('''
         ...      >>> x = 2
         ...      >>> raise KeyError
         ...      ''', {}, 'foo', 'foo.py', 0)

>>> runner.run(test)
         Traceback (most recent call last):
         ...
         UnexpectedException: <DocTest foo from foo.py:0 (2 examples)>

>>> del test.globs['__builtins__']
         >>> test.globs
         {'x': 2}

But the globals are cleared if there is no error:

>>> test = DocTestParser().get_doctest('''
         ...      >>> x = 2
         ...      ''', {}, 'foo', 'foo.py', 0)

>>> runner.run(test)
         TestResults(failed=0, attempted=1)

>>> test.globs
         {}

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Test examples in docstrings in functions and classes reachable
    from module m (or the current module if m is not supplied), starting
    with m.__doc__.

Also test examples reachable from dict m.__test__ if it exists and is
    not None.  m.__test__ maps names to functions, classes and strings;
    function and class docstrings are tested even if the name is private;
    strings are tested directly, as if they were docstrings.

Return (#failures, #tests).

See help(doctest) for an overview.

Optional keyword arg "name" gives the name of the module; by default
    use m.__name__.

Optional keyword arg "globs" gives a dict to be used as the globals
    when executing examples; by default, use m.__dict__.  A copy of this
    dict is actually used for each docstring, so that each docstring's
    examples start with a clean slate.

Optional keyword arg "extraglobs" gives a dictionary that should be
    merged into the globals that are used to execute examples.  By
    default, no extra globals are used.  This is new in 2.4.

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,
    and defaults to 0.  This is new in 2.3.  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
        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.

Advanced tomfoolery:  testmod runs methods of a local instance of
    class doctest.Tester, then merges the results into (or creates)
    global Tester instance doctest.master.  Methods of doctest.master
    can be called directly too, if you want to do something unusual.
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Test examples in the given file.  Return (#failures, #tests).

Optional keyword arg "module_relative" specifies how filenames
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- If "module_relative" is True (the default), then "filename"
         specifies a module-relative path.  By default, this path is
         relative to the calling module's directory; but if the
         "package" argument is specified, then it is relative to that
         package.  To ensure os-independence, "filename" should use
         "/" characters to separate path segments, and should not
         be an absolute path (i.e., it may not begin with "/").

- If "module_relative" is False, then "filename" specifies an
        os-specific path.  The path may be absolute or relative (to
        the current working directory).

Optional keyword arg "name" gives the name of the test; by default
    use the file's basename.

Optional keyword argument "package" is a Python package or the
    name of a Python package whose directory should be used as the
    base directory for a module relative filename.  If no package is
    specified, then the calling module's directory is used as the base
    directory for module relative filenames.  It is an error to
    specify "package" if "module_relative" is False.

Optional keyword arg "globs" gives a dict to be used as the globals
    when executing examples; by default, use {}.  A copy of this dict
    is actually used for each docstring, so that each docstring's
    examples start with a clean slate.

Optional keyword arg "extraglobs" gives a dictionary that should be
    merged into the globals that are used to execute examples.  By
    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 "optionflags" or's together module constants,
    and defaults to 0.  Possible values (see the docs for details):

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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    global Tester instance doctest.master.  Methods of doctest.master
    can be called directly too, if you want to do something unusual.
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`compileflags` gives the set of flags that should be used by the
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      ...                          REPORT_ONLY_FIRST_FAILURE) == old
      True

>>> doctest._unittest_reportflags == (REPORT_NDIFF |
      ...                                   REPORT_ONLY_FIRST_FAILURE)
      True

Only reporting flags can be set:

>>> doctest.set_unittest_reportflags(ELLIPSIS)
      Traceback (most recent call last):
      ...
      ValueError: ('Only reporting flags allowed', 8)

>>> doctest.set_unittest_reportflags(old) == (REPORT_NDIFF |
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The unit test framework includes a debug method on test cases
           and test suites to support post-mortem debugging.  The test code
           is run in such a way that errors are not caught.  This way a
           caller can catch the errors and initiate post-mortem debugging.

The DocTestCase provides a debug method that raises
           UnexpectedException errors if there is an unexpected
           exception:

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

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

>>> failure.test is test
             True

>>> failure.example.want
             '42\n'

>>> exc_info = failure.exc_info
             >>> raise exc_info[0], exc_info[1], exc_info[2]
             Traceback (most recent call last):
             ...
             KeyError

If the output doesn't match, then a DocTestFailure is raised:

>>> test = DocTestParser().get_doctest('''
             ...      >>> x = 1
             ...      >>> x
             ...      2
             ...      ''', {}, 'foo', 'foo.py', 0)
             >>> case = DocTestCase(test)

>>> try:
             ...    case.debug()
             ... except DocTestFailure, failure:
             ...    pass

DocTestFailure objects provide access to the test:

>>> failure.test is test
             True

As well as to the example:

>>> failure.example.want
             '2\n'

and the actual output:

>>> failure.got
             '1\n'

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    tests in a doc string fail, then the test case fails.  An exception
    is raised showing the name of the file containing the test and a
    (sometimes approximate) line number.

The `module` argument provides the module to be tested.  The argument
    can be either a module or a module name.

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
      tests in each file. The setUp function will be passed a DocTest
      object.  The setUp function can access the test globals as the
      globs attribute of the test passed.

tearDown
      A tear-down function.  This is called after running the
      tests in each file.  The tearDown function will be passed a DocTest
      object.  The tearDown function can access the test globals as the
      globs attribute of the test passed.

globs
      A dictionary containing initial global variables for the tests.

optionflags
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      If "module_relative" is True, then the given file paths are
      interpreted as os-independent module-relative paths.  By
      default, these paths are relative to the calling module's
      directory; but if the "package" argument is specified, then
      they are relative to that package.  To ensure os-independence,
      "filename" should use "/" characters to separate path
      segments, and may not be an absolute path (i.e., it may not
      begin with "/").

If "module_relative" is False, then the given file paths are
      interpreted as os-specific paths.  These paths may be absolute
      or relative (to the current working directory).

package
      A Python package or the name of a Python package whose directory
      should be used as the base directory for module relative paths.
      If "package" is not specified, then the calling module's
      directory is used as the base directory for module relative
      filenames.  It is an error to specify "package" if
      "module_relative" is False.

globs
      A dictionary containing initial global variables for the tests.

optionflags
      A set of doctest option flags expressed as an integer.

parser
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encoding
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Converts text with examples to a Python script.  Example input is
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>>> text = '''
       ...       Here are examples of simple math.
       ...
       ...           Python has super accurate integer addition
       ...
       ...           >>> 2 + 2
       ...           5
       ...
       ...           And very friendly error messages:
       ...
       ...           >>> 1/0
       ...           To Infinity
       ...           And
       ...           Beyond
       ...
       ...           You can use logic if you want:
       ...
       ...           >>> if 0:
       ...           ...    blah
       ...           ...    blah
       ...           ...
       ...
       ...           Ho hum
       ...           '''

>>> print script_from_examples(text)
       # Here are examples of simple math.
       #
       #     Python has super accurate integer addition
       #
       2 + 2
       # Expected:
       ## 5
       #
       #     And very friendly error messages:
       #
       1/0
       # Expected:
       ## To Infinity
       ## And
       ## Beyond
       #
       #     You can use logic if you want:
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Methods:
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    1
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>>> t = _TestClass(123)
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        123
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>>> _TestClass(13).square().get()
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                      R�s�
                                    In 2.2, boolean expressions displayed
                                    0 or 1.  By default, we still accept
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                                    DONT_ACCEPT_TRUE_FOR_1 to the new
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                                    >>> 4 == 4
                                    1
                                    >>> 4 == 4
                                    True
                                    >>> 4 > 4
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                                    False
                                    sbool-int equivalences�
                Blank lines can be marked with <BLANKLINE>:
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            tellipsiss|
                If the whitespace normalization flag is used, then
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                    >>> print range(30) #doctest: +NORMALIZE_WHITESPACE
                    [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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