'Divide two Rats, or a Rat and a number (reversed args).'

def __rtruediv__(self, other):

    if isRat(other):
        return Rat((other.__num * self.__den), (other.__den * self.__num))
    if isint(other):
        return Rat((other * self.__den), self.__num)
    if isnum(other):
        return (other / float(self))
    return NotImplemented
