装饰器 定义： 本质是函数，（装饰其他函数）就时为其他函数添加附加功能 原则： 1、不能修改被装饰的函数的源代码 2、不能修改被装饰的函数的调用方式 实现装饰器的知识储备： 1、函数即“变量” 2、高阶函数 a:把一个函数名当做实参传给另一个函数(在不修改被装饰函数源代码的情况下为其添加功能) b:返回值中包含函数名(不修改函数调用方式) 3、嵌套函数 高阶函数+嵌套函数 ==装饰器 def logger(): print('logging') def test1(): logger() pass def test2(): logger() pass test1() test2() 
import timedef timmer(func): def warpper(*args,**kwargs): start_time = time.time() func() stop_time = time.time() print("the func time is %s"%(stop_time-start_time)) return warpper@timmerdef test1(): time.sleep(3) print("in the test1")test1() #Author:Brill #EXP1def foo(): print('in the foo') bar()def bar(): print("in the bar")foo()#EXP2import timedef bar(): time.sleep(3) print("in the bar ")def test1(func): start_time = time.time() func() #run time stop_time = time.time() print("the func run time is %s"%(stop_time-start_time))test1(bar)#Exp3import timedef bar(): time.sleep(3) print("in the bar ")def test2(func): print(func) return func#print(test2(bar))bar = test2(bar)bar() #run bar #Author:Brill import timedef timer(func): #timer(test1) func = test1 def deco(): start_time = time.time() func() #run test1 stop_time = time.time() print("the func run time is %s" % (stop_time - start_time)) return deco@timer # test1 = timer(test1)def test1(): time.sleep(3) print("in the test1")@timerdef test2(): time.sleep(3) print("in the test2")test1() #--->decotest1() #Author:Brill import timedef timer(func): #timer(test1) func = test1 def deco(*args,**kwarge): start_time = time.time() func(*args,**kwarge) #run test1 stop_time = time.time() print("the func run time is %s" % (stop_time - start_time)) return deco@timer # test1 = timer(test1)def test1(): time.sleep(1) print("in the test1")@timer # test2 = timer(test2) = deco test2=test(name)def test2(name,age): time.sleep(3) print("test2:",name,age)test1( ) #--->decotest2("alex",22) 斐波那契数列：
#Author:Brill def fib(max): n,a,b,=0,0,1 while n