class dog:

	def __cmp__(self,other):

		if other >0:

			print "1"

			return 1

		elif other < 0:

			print other

			print "2"

			return -1

		else:

			print other

			return 0



下面是我执行的结果;

>>> x = dog()

>>> print (x >2)

1

True

>>> print (x>2)

1

True

>>> print (x > -2)

-2

2

False

>>> if (-1): print "test"



test

>>> print (x ==0)

0

True

if other >0:

          print "1"

          return 1

elif other < 0:

	print other

	print "2"

	return -1