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def foo(x,y):        """        >>> foo(1,1)        2        >>> foo(1,1)        3        """        return x+yif __name__ == '__main__':        import doctest        doctest.testmod()----------[fawad@fawad5 ~]$ python foo.py**********************************************************************File "foo.py", line 5, in __main__.fooFailed example:    foo(1,1)Expected:    3Got:    2**********************************************************************1 items had failures:   1 of   2 in __main__.foo***Test Failed*** 1 failures.