randSeq.py

#!/usr/bin/env python

class NumStr(object):

    def __init__(self, num=0, string=''):
        self.__num = num
        self.__string = string

    def __str__(self):    		# define for str()
        return '[%d :: %r]' % \
            (self.__num, self.__string)
    __repr__ = __str__

    def __add__(self, other):           # define for s+o
        if isinstance(other, NumStr):
            return self.__class__(self.__num + \
                other.__num,
                self.__string + other.__string)
        else:
            raise TypeError, \
'Illegal argument type for built-in operation'

    def __mul__(self, num):           # define for s*o
        if isinstance(num, int):
            return self.__class__(self.__num * num,
                self.__string * num)
        else:
            raise TypeError, \
'Illegal argument type for built-in operation'

    def __nonzero__(self):              # reveal tautology
        return self.__num or len(self.__string)

    def __norm_cval(self, cmpres):      # normalize cmp()
        return cmp(cmpres, 0)

    def __cmp__(self, other):           # define for cmp()
        return self.__norm_cval(
                cmp(self.__num, other.__num)) + \
            self.__norm_cval(
                cmp(self.__string, other.__string))