py之装饰器

1，装饰器带类参数

# -*- coding:utf-8 -*-
'''''示例8: 装饰器带类参数'''

class locker:
    def __init__(self):
        print("locker.__init__() should be not called.")

    @staticmethod
    def acquire():
        print("locker.acquire() called.（这是静态方法）")

    @staticmethod
    def release():
        print("  locker.release() called.（不需要对象实例）")

def deco(cls):
    '''''cls 必须实现acquire和release静态方法'''
    def _deco(func):
        def __deco():
            print("before %s called [%s]." % (func.__name__, cls))
            cls.acquire()
            try:
                return func()
            finally:
                cls.release()
        return __deco
    return _deco

@deco(locker)
def myfunc():
    print(" myfunc() called.")

myfunc()
myfunc()

2，类中定义和调用

import math
import time
from functools import wraps



def deco(func):
    print "Enter deco"
    def wrapper(*args, **kwargs):
        print "Enter deco wrapper"
        start = time.time()
        func(*args, **kwargs)
        end = time.time()
        msecs = (end - start)*1000
        print "-->:%s ms" % msecs
    return wrapper


class MathFuc:

    __X = 1

    def jia(self,x,y):
        return x + y

    def cheng(self,x ,y):
        return x * y

    def testFuc(self,x, o ,y):
        operate = {'+':self.jia,'*':self.cheng}

        print operate.get(o)(x, y)
        print 'operate[o](x, y):',operate[o](x, y)
        print '__X is old', self.__X


    @deco
    def myfunc(self,a,b):
        print "start func"
        time.sleep(0.8)
        print "end func"
        print "rest is %s"%(a+b)


    @classmethod
    def tearDownClass(self):
        MathFuc.__X = 10
        print 'MathFuc Down X is ', MathFuc.__X

    @staticmethod
    def staticClass():
        MathFuc.__X = 20
        print 'static MathFuc X is ', MathFuc.__X


if __name__ =='__main__':

    fun = MathFuc()

    fun.myfunc(6, 7)

    print fun.myfunc.__name__