(self, other )
return other - self
Implementation of - operator when left operand is not a :class:`ParserElement`
Implementation of - operator when left operand is not a :class:`ParserElement`
Implementation of - operator when left operand is not a : class : ParserElement
def __rsub__(self, other ):
        """
        Implementation of - operator when left operand is not a :class:`ParserElement`
        """
        if isinstance( other, basestring ):
            other = ParserElement._literalStringClass( other )
        if not isinstance( other, ParserElement ):
            warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
                    SyntaxWarning, stacklevel=2)
            return None
        return other - self
def __rsub__ ( self , other ) : if isinstance ( other , basestring ) : other = ParserElement . _literalStringClass ( other ) if not isinstance ( other , ParserElement ) : warnings . warn ( "Cannot combine element of type %s with ParserElement" % type ( other ) , SyntaxWarning , stacklevel = 2 ) return None return other - self