Python基础课:装饰器和闭包

#4.装饰器
#闭包
def fx(x):
    x += 1
    def fy(y):
        return x*y
    return fy
 
def f1(func):
    #print('f1 runing')
    def f2(y):
        print('f2 runing')
        return func(y) + 1
    return f2
 
def gun(m):
    print('gun runing')
    return m*m
 
#f1(gun)
#fg = f1(gun)
def fun(m):
    print('f2 runing')
    return gun(m) + 1
#fg(1)
#fun(1)
 
@f1
def deco(m):
    print('这是deco')
    return m*m  #这里通过装饰器的作用,实现给deco的返回值加 1 的功能
 
"""
打个比方,正常人都会穿鞋,但是呢有些人在鞋子里面就会放个增高鞋垫,这个增高鞋垫
不影响穿鞋子,但是呢会让穿的人看上去更高一点,装饰器就像这个增高鞋垫一样,
它不影响函数的正常使用,但是可以给函数增加更多的功能
"""
import time
def run_time(func):
    def new_fun(*args,**kwargs):
        t0 = time.time()
        print('star time: %s'%(time.strftime('%x',time.localtime())) )
        back = func(*args)
        print('end time: %s'%(time.strftime('%x',time.localtime())) )
        print('run time: %s'%(round(time.time() - t0),4)
        return back
    return new_fun
     
@run_time
def test():
    for i in range(1,10):
        for j in range(1,i+1):
            print('%dx%d=%2s'%(j,i,i*j),end = ' ')
        print ()
 
 
class Test_Class:
    def __init__(self,func):
        self.func = func
         
    def __call__(self):
        print('')
        return self.func
 
 
@Test_Class
def fun_test():
    print('这是个测试函数')
 
#fun_test()()
 
#4.类装饰器
class Rectangle:
    def __init__(self,length,width):
        self.width = width
        self.length = length
    def area(self):       #实例方法
        areas = self.length * self.width
        return areas
     
    @property  #就像访问属性一样访问方法
    def fun(self):
        return self.width*self.length
     
    @staticmethod  #不用传self
    def func():
        print('staticmethod func')
         
    @classmethod
    def show(cls):
        print(cls)
        print('show fun')
 
 
e = Rectangle(3,4)
f = Rectangle(6,8)

 

posted on 2017-07-01 02:04  yue_bei  阅读(154)  评论(0编辑  收藏  举报

导航