numstr.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))