Python 元类的例子

pgt112you

                               
               
                #coding:utf-8
class FA(type):
    def __new__(cls, name, base, attr):
        print name
        print base
        print attr
        print "it is in fa's new"
        new_obj = super(FA, cls).__new__(cls, name, base, attr)
        return new_obj
class FB(object):
    __metaclass__ = FA
    def __init__(self):
        print "it is in FB's init"        
        
b = FB()
结果是：
C:\>python test.py
FB
(,)
{'__module__': '__main__', '__metaclass__': , '__init__': }
it is in fa's new
it is in FB's init
               
               

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u3/103690/showart_2073624.html