#!/usr/bin/env python

# encoding: utf-8

#

# Copyright (c) 2008 Doug Hellmann All rights reserved.

#

"""

不仅仅适用于内置类型 还适用于用户类型

"""

__version__ = "$Id$"

#end_pymotw_header

from operator import *

class MyObj(object):

"""Example for operator overloading"""

def __init__(self, val):

super(MyObj, self).__init__()

self.val = val

return

def __str__(self):

return 'MyObj(%s)' % self.val

def __lt__(self, other):

"""compare for less-than"""

print 'Testing %s < %s' % (self, other)

return self.val < other.val

def __add__(self, other):

"""add values"""

print 'Adding %s + %s' % (self, other)

return MyObj(self.val + other.val)

a = MyObj(1)

b = MyObj(2)

print 'Comparison:'

print lt(a, b)

# Comparison:

# Testing MyObj(1) < MyObj(2)

# True

#

print '\nArithmetic:'

print add(a, b)

# Arithmetic:

# Adding MyObj(1) + MyObj(2)

# MyObj(3)

#