Date5

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 time
def 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

@timmer

def test1():
    time.sleep(3)
    print("in the test1")

test1()

#Author:Brill 
#EXP1
def foo():
    print('in the foo')
    bar()
def bar():
    print("in the bar")
foo()
#EXP2
import time
def 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)
#Exp3
import time
def 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 time
def 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")

@timer
def test2():
    time.sleep(3)
    print("in the test2")


test1()    #--->deco
test1()

#Author:Brill 
import time
def 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( ) #--->deco
test2("alex",22)

 斐波那契数列：

#Author:Brill 
def fib(max):
    n,a,b,=0,0,1
    while n<max:
        print(b)
        a,b = b ,a+b
        n= n+1
    return 'Done'
fib(100)