请教Python 使用装饰器实现单例模式的原理?

private = ':
#     ;python2
# coding: utf-8
def deco(f);
for i in xrange(5);
# @deco
# def simple();a simple2 fun"., private[0]
        f()
        private[0] += 1
    return wrap
@deco
def simple()def func():
        print '.
 是下面代码的简写
 func = deco(func)
 这就是装饰器做的事情
[0]
private =  0
a simple fun
private =  1
a simple fun
private =  2
a simple fun
private =  3
a simple fun
private =  4
a simple fun
[0]
private =  0
a simple2 fun
private =  1
a simple2 fun
private =  2
a simple2 fun
private =  3
a simple2 fun
private =  4
a simple2 fun
复制代码
#.;bin/a simple fun"!/:
    print ":
     .:
    simple()
def simple2():
    print "usr/.:
    private = [0]
    print private
# wrap 是一个closure
    def wrap().
# 是下面代码的简写
# simple = deco(simple)
# 这就是装饰器做的事情 
simple2 = deco(simple2)
for i in xrange(5)