(self, key, defval = None)
>>> d = OrderedDict(((1, 3), (3, 2), (2, 1)))
        >>> d.setdefault(1)
        3
        >>> d.setdefault(4) is None
        True
        >>> d
        OrderedDict([(1, 3), (3, 2), (2, 1), (4, None)])
        >>> d.setdefault(5, 0)
        0
        >>> d
        OrderedDict([(1, 3), (3, 2), (2, 1), (4, None), (5, 0)])
>>> d = OrderedDict(((1, 3), (3, 2), (2, 1)))
        >>> d.setdefault(1)
        3
        >>> d.setdefault(4) is None
        True
        >>> d
        OrderedDict([(1, 3), (3, 2), (2, 1), (4, None)])
        >>> d.setdefault(5, 0)
        0
        >>> d
        OrderedDict([(1, 3), (3, 2), (2, 1), (4, None), (5, 0)])
>>> d = OrderedDict ((( 1 3 ) ( 3 2 ) ( 2 1 ))) >>> d . setdefault ( 1 ) 3 >>> d . setdefault ( 4 ) is None True >>> d OrderedDict ( [ ( 1 3 ) ( 3 2 ) ( 2 1 ) ( 4 None ) ] ) >>> d . setdefault ( 5 0 ) 0 >>> d OrderedDict ( [ ( 1 3 ) ( 3 2 ) ( 2 1 ) ( 4 None ) ( 5 0 ) ] )
def setdefault(self, key, defval = None):
        """
        >>> d = OrderedDict(((1, 3), (3, 2), (2, 1)))
        >>> d.setdefault(1)
        3
        >>> d.setdefault(4) is None
        True
        >>> d
        OrderedDict([(1, 3), (3, 2), (2, 1), (4, None)])
        >>> d.setdefault(5, 0)
        0
        >>> d
        OrderedDict([(1, 3), (3, 2), (2, 1), (4, None), (5, 0)])
        """
        if key in self:
            return self[key]
        else:
            self[key] = defval
            return defval
def setdefault ( self , key , defval = None ) : if key in self : return self [ key ] else : self [ key ] = defval return defval