# 一：编写函数，（函数执行的时间是随机的）

import time

import random

# def foo():

#     time.sleep(random.randrange(1,5))

#     print('haha')

# foo()

# 二：编写装饰器，为函数加上统计时间的功能

# def timmer(func):

#     def wrapper():

#         start_time=time.time()

#         func()

#         stop_time=time.time()

#         print('run time is %s'%(stop_time-start_time))

#     return wrapper

# @timmer

# def foo():

#     time.sleep(random.randrange(1,5))

#     print('haha')

# foo()

# 三：编写装饰器，为函数加上认证的功能

# def auth(func):

#     def deco():

#         name=input('name: ')

#         pwd=input('password: ')

#         if name=='egon' and pwd=='123':

#             print('login successful')

#             func()

#         else:

#             print('login erro')

#     return deco

# @auth

# def foo():

#     time.sleep(random.randrange(1,5))

#     print('haha')

# foo()

# 四：编写装饰器，为多个函数加上认证的功能（用户的账号密码来源于文件），要求登录成功一次，后续的函数都无需再输入用户名和密码

#     注意：从文件中读出字符串形式的字典，可以用eval('{"name":"egon","password":"123"}')转成字典格式

# user_dic={

#     'egon':'123',

#     'alex':'alex3714',

#     'wupeiqi':'wu13',

#     'yuanhao':'123123'

# }

# with open('db.txt','w',encoding='utf-8') as f:

#     f.write(str(user_dic))

# with open('db.txt','r',encoding='utf-8') as f:

#     res=f.read()

#     #print(res,type(res))#字符串类型

#     user_dic=eval(res)

#     #print(user_dic,type(user_dic))#字典类型

# db_path='db.txt'

# login_dic={

#     'user':None,

#     'status':False,

# }

# def auth(func):

#     def wrapper(*args,**kwargs):

#         if login_dic['user'] and login_dic['status']:

#             res = func(*args, **kwargs)

#             return res

#         name=input('your name: ')

#         password=input('your password: ')

#         with open(db_path,'r',encoding='utf-8') as f:

#             user_dic=eval(f.read())

#         if name in user_dic and password == user_dic[name]:

#                 print('login ok')

#                 login_dic['user']=name

#                 login_dic['status']=True

#                 res=func(*args,**kwargs)

#                 return res

#         else:

#             print('login err')

#     return wrapper

# @auth #auth(index)

# def index():

#     print('welecome to index')

# @auth

# def home(name):

#     print('welecome %s to home page' %name)

# index()

# home('egon')

# 五：编写下载网页内容的函数，要求功能是：用户传入一个url，函数返回下载页面的结果

# from urllib.request import urlopen

# def index(url):

#     def get():

#         return urlopen(url).read()

#     return get

# python = index('https://www.python.org')

# print(python())

# 六：为题目五编写装饰器，实现缓存网页内容的功能：

#     具体：实现下载的页面存放于文件中，如果文件内有值（文件大小不为0），

# 就优先从文件中读取网页内容，否则，就去下载，然后存到文件中

# from urllib.request import urlopen

# import os

# cache_path=r'C:\Users\Administrator\PycharmProjects\python5期\day8\cache.txt'

# def make_cache(func):

#     def wrapper(*args,**kwargs):

#         if os.path.getsize(cache_path):

#             #有缓存,文件不为空

#             print('\033[45m=========>有缓存\033[0m')

#             with open(cache_path,'rb') as f:

#                 res=f.read()

#         else:

#             res=func(*args,**kwargs) #下载

#             with open(cache_path,'wb') as f: #制作缓存

#                 f.write(res)

#         return res

#     return wrapper

# @make_cache

# def get(url):

#     return urlopen(url).read()

# print('================>first')

# print(get('https://www.python.org'))

# print('================>second')

# print(get('https://www.python.org'))

# print('================>third')

# print(get('https://www.python.org'))

# 七：还记得我们用函数对象的概念，制作一个函数字典的操作吗，

# 来来来，我们有更高大上的做法，在文件开头声明一个空字典，

# 然后在每个函数前加上装饰器，完成自动添加到字典的操作

# func_dic = {}

# def deco(key):

#     def deco2(func):

#         func_dic[key]=func

#     return deco2

# @deco('f1')#@deco2  func1=deco2(func1)

# def func1():

#     print("from f1")

# @deco('f2')

# def func2():

#     print("from f2")

# @deco('f3')

# def func3():

#     print("from f3")

# print(func_dic)

# while True:

#     cmd=input('>>: ').strip()

#     if cmd in func_dic:

#         func_dic[cmd]()