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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getName(self):
 r""" Returns the results name for this token expression. Useful when several different expressions might match at a particular location. Example:: integer = Word(nums) ssn_expr = Regex(r"\d\d\d-\d\d-\d\d\d\d") house_number_expr = Suppress('#') + Word(nums, alphanums) user_data = (Group(house_number_expr)("house_number") | Group(ssn_expr)("ssn") | Group(integer)("age")) user_info = OneOrMore(user_data) result = user_info.parseString("22 111-22-3333 #221B") for item in result: print(item.getName(), ':', item[0]) prints:: age : 22 ssn : 111-22-3333 house_number : 221B """

        if self.__name:
            return self.__name
        elif self.__parent:
            par = self.__parent()
            if par:
                return par.__lookup(self)
            else:
                return None
        elif (len(self) == 1 and
               len(self.__tokdict) == 1 and
               next(iter(self.__tokdict.values()))[0][1] in (0,-1)):
            return next(iter(self.__tokdict.keys()))
        else:
            return None