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class NumStr(object):
def __init__(self, num=0, string=''):
self.__num = num
self.__string = string
def __str__(self):
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 o*n
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): # False if both are
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))
a = NumStr(3, 'foo')
b = NumStr(3, 'goo')
c = NumStr(2, 'foo')
d = NumStr()
e = NumStr(string='boo')
f = NumStr(1)
print a
print b
print c
print d
print e
print f
print a < b
print b < c
print a == a
print b * 2
print a * 3
print b + e
print e + b
if d: 'not false' # also bool(d)
if e: 'not false' # also bool(e)
print cmp(a,b)
print cmp(a,c)
print cmp(a,a)
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