闭包和装饰器

#闭包,嵌套函数，内部函数调用外部函数的变量
# def outer():
#     a = 1
#     def inner():
#         print(a)
#     return inner
# 
# inn = outer()
# inn()
# 
# from urllib.request import urlopen
# 
# def get_url():
#     url = 'http://www.xiaohua100.cn/index.html'
#     def get():
#         geting = urlopen(url).read()
#         print(geting)
#     return get
# 
# wget = get_url()
# wget()

# 装饰器的雏形
# def wrapper(f):
#     def inner():
#         f()
#         print(1)
#     return inner
#
# def func():
#     print(2)
#
# f = wrapper(func)
# f()

# 装饰器形成的过程 : 有返回值的 有一个参数*args  万能参数**kwargs
# 装饰器的作用
# 原则 ：开放封闭原则
# 语法糖 ：@
# 装饰器的固定模式

# import time
# 
# 
# def wraper(f):                    # 装饰器函数，f是被装饰的函数
#     def inner(*args, **kwargs):
#         start = time.time()
#         f(*args, **kwargs)
#         end = time.time()
#         c = end - start
#         print(c)
#     return inner
# 
# 
# @wraper                        # 语法糖，装饰器函数名，等于 sleeps = wraper(sleeps)
# def sleeps(a, b):              # 被装饰的函数,带2个参数
#     time.sleep(2)
#     print("睡眠2秒", a, b)
# 
# 
# @wraper                        # 语法糖，装饰器函数名，等于 sleeps = wraper(sleeps)
# def sleeps1(a):                # 被装饰的函数,带1个参数
#     time.sleep(2)
#     print("睡眠2秒", a)
# 
# sleeps(1, b =2)
# sleeps1(1)