闭包函数+装饰器

目录

• 闭包函数
• 装饰器：

闭包函数

 1.闭包函数必须在函数内部定义
 2.闭包函数可以引用外层函数的名字
 闭包函数是 函数嵌套、函数对象、名称空间与作用域 结合体。

直接调用

# def func(x):
#     print(x)
# func(1010)

通过闭包函数传参

# def outer(number):
#     print(number)
#     def inner():
#         print(number)
#     return inner
#
# func = outer(100)
# func()

直接传入地址,爬取小哥哥的博客

# import requests
# def spider_func(url):
#     response = requests.get(url)
#     if response.status_code == 200:
#         print(len(response.text))
#         print(response.text)
# url = 'https://www.cnblogs.com/zhulipeng-1998/'
# spider_func(url)

通过闭包传入地址,爬取小哥哥博客

# import time
# import requests
# def spider_outer(url):
#     def spider_inner():
#         start_time = time.time()
#         response = requests.get(url)
#         end_time = time.time()
#         if response.status_code == 200:
#             print(f'爬取需要的时间{end_time - start_time}')
#             print(len(response.text))
#             print(response.text)
#     return spider_inner
# spider_jingdong = spider_outer('https://www.cnblogs.com/zhulipeng-1998/')
# spider_jingdong()

试着让用户输入网址爬出内容，没有成功

import time
import requests
def spider_outer(url):
    def spider_inner():
        start_time = time.time()
        response = requests.get(url)
        end_time = time.time()
        if response.status_code == 200:
            print(f'爬取需要的时间{end_time - start_time}')
            print(len(response.text))
            print(response.text)
    return spider_inner
chioce = input('请输入爬取网址：')
spider_chioce = spider_outer('chioce')
spider_chioce()

装饰器：

不修改被装饰对象的源代码
不修改被装饰对象的调用方式

闭包传入,添加计时功能

# import time
#
# def time_record(func):
#     start_time = time.time()
#     func()
#     end_time = time.time()
#     print(f'下载电影消耗的时间{end_time - start_time}')
#     return '苍天老师的大片'
# def download_movie():
#     print('开始下载电影....')
#     time.sleep(5)
#     print('电影下载成功...')
#     return
# res = time_record(download_movie)
# for i in res:
#     print(i)

初级装饰器，无返回值

# import time
# def download_movie(name):
#     print('开始下载电影.....')
#     time.sleep(3)
#     print('电影下载成功.....')
#     return f'{name}救援队高清无码.mp4'
#
# def time_record(func):
#     def inner(*args, **kwargs):
#         start_time = time.time()
#         res = func(*args, **kwargs)
#         end_time = time.time()
#         print(f'下载消耗时间{end_time - start_time}')
#         return res
#     return inner
# download_movie = time_record(download_movie)
# download_movie(name='nick')

有返回值，但是没有接收到，打印了res,不知道对不对

# import time
# def download_movie():
#     print('开始下载电影.....')
#     time.sleep(3)
#     print('电影下载成功.....')
#     return '救援队高清无码.mp4'
#
# def time_record(func):
#     def inner(*args, **kwargs):
#         start_time = time.time()
#         res = func(*args, **kwargs)
#         print(res)
#         end_time = time.time()
#         print(f'下载消耗时间{end_time - start_time}')
#         return res
#     return inner
#
# download_movie = time_record(download_movie)
# download_movie()

最终版本

# def wrapper(func):
#     def inner(*args,**kwargs):
#         username = input('请输入名字')
#         if username == 'dsb':
#             res = func(*args,**kwargs)
#             return res
#
#         else:
#             print('用户权限不足')
#     return inner
#
# def func1():
#     pass
#
# func1 = wrapper(func1)
# func1()


### def wrapper(func):
        def inner(*args,**kwargs):
            res = func(*args,**kwargs)
            return res
        return inner

魔法糖

import time
'''def wrapper(func):
    def inner(*args,**kwargs):
        res = func(*args, **kwargs)
        return res
    return inner

@wrapper
def func1():
    pass
def func2():
    pass

func1()'''

来源：https://www.cnblogs.com/zhulipeng-1998/p/11844314.html