20.03.23作业

import time
# 一：编写函数，（函数执行的时间用time.sleep(n)模拟）
# def index():
#     time.sleep(3)
#     print('执行完毕')
# index()
# 二：编写装饰器，为函数加上统计时间的功能
# def timer(func):
#     def wrapper(*args,**kwargs):
#         start_time = time.time()
#         func(*args,**kwargs)
#         stop_time = time.time()
#         print('执行时间为：',stop_time - start_time)
#     return wrapper
# @timer
# def index():
#     time.sleep(3)
#     print('执行完毕')
# index()
# 三：编写装饰器，为函数加上认证的功能
# def auth(func):
#     def wrapper(*args,**kwargs):
#         user = input('请输入用户名：').strip()
#         pwd = input('请输入密码：').strip()
#         if user == 'egon' and pwd == '123':
#             func(*args,**kwargs)
#         else:
#             print('用户名或密码错误')
#     return wrapper
# @auth
# def index():
#     time.sleep(3)
#     print('执行完毕')
# index()



# 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
# login_user=None
# def auth(func):
#     def wrapper(*args,**kwargs):
#         global login_user
#         if login_user == None:
#             print('请先登录'.center(30,'*'))
#             user = input('请输入用户名：').strip()
#             pwd = input('请输入密码：').strip()
#             with open(r'user.txt','r',encoding='utf-8') as f:
#                 for line in f:
#                     # print(line)
#                     user_info = eval(line)
#                     if user == user_info['name'] and pwd == user_info['password']:
#                         print('认证成功'.center(30,'*'))
#                         login_user = user
#                         func(*args,**kwargs)
#                     else:
#                         print('认证失败'.center(30,'*'))
#         else:
#             func(*args,**kwargs)
#     return wrapper
#
# @auth
# def recharge():
#     print('这是充值功能'.center(30,'*'))
#
# @auth
# def transfer_accounts():
#     print('这是转账功能'.center(30,'*'))
#
# @auth
# def reflect():
#     print('这是提现功能'.center(30,'*'))
#
# @auth
# def check_the_balance():
#     print('这是查询余额功能'.center(30,'*'))
#
# @auth
# def sign_out():
#     print('这是退出功能'.center(30,'*'))
# login_dic = {
#         '0': (sign_out,'退出'),
#         '1': (recharge,'充值'),
#         '2': (transfer_accounts,'转账'),
#         '3': (reflect,'提现'),
#         '4': (check_the_balance,'查询余额')
#     }
# while True:
#     for k in login_dic:
#         print('{}---{}'.format(k,login_dic[k][1]))
#     cmd = input('请输入指令：').strip()
#     if not cmd.isdigit():
#         print('请输入数字指令')
#     if cmd not in login_dic:
#         print('请输入正确的指令')
#     else:
#         login_dic.get(cmd)[0]()

# 五：编写装饰器，为多个函数加上认证功能，要求登录成功一次，在超时时间内无需重复登录，超过了超时时间，则必须重新登录

# login_user=None
# login = {'login_time': 0,'out_time':5}
# def auth(func):
#     def wrapper(*args,**kwargs):
#         global login_user
#         start_time = time.time()
#         if login_user == None:
#             print('请先登录'.center(30,'*'))
#             user = input('请输入用户名：').strip()
#             pwd = input('请输入密码：').strip()
#             with open(r'user.txt','r',encoding='utf-8') as f:
#                 for line in f:
#                     user_info = eval(line)
#                     if user == user_info['name'] and pwd == user_info['password']:
#                         print('认证成功'.center(30,'*'))
#                         login_user = user
#                         func(*args, **kwargs)
#                         #如果登录时间超过5s下次执行指令需重新登录
#                         login['login_time'] = time.time()
#                         if login['login_time'] - start_time > login['out_time']:
#                             login_user = None
#                     else:
#                         print('认证失败'.center(30,'*'))
#         else:
#             func(*args,**kwargs)
#     return wrapper
#
# @auth
# def recharge():
#     print('这是充值功能'.center(30,'*'))
#
# @auth
# def transfer_accounts():
#     print('这是转账功能'.center(30,'*'))
#
# @auth
# def reflect():
#     print('这是提现功能'.center(30,'*'))
#
# @auth
# def check_the_balance():
#     print('这是查询余额功能'.center(30,'*'))
#
# @auth
# def sign_out():
#     print('这是退出功能'.center(30,'*'))
# login_dic = {
#         '0': (sign_out,'退出'),
#         '1': (recharge,'充值'),
#         '2': (transfer_accounts,'转账'),
#         '3': (reflect,'提现'),
#         '4': (check_the_balance,'查询余额')
#     }
# while True:
#     for k in login_dic:
#         print('{}---{}'.format(k,login_dic[k][1]))
#     cmd = input('请输入指令：').strip()
#     if not cmd.isdigit():
#         print('请输入数字指令')
#     if cmd not in login_dic:
#         print('请输入正确的指令')
#     else:
#         login_dic.get(cmd)[0]()

# 六：选做题
# 思考题（选做），叠加多个装饰器，加载顺序与运行顺序，可以将上述实现的装饰器叠加起来自己验证一下
# @deco1 # index=deco1(deco2.wrapper的内存地址)
# @deco2 # deco2.wrapper的内存地址=deco2(deco3.wrapper的内存地址)
# @deco3 # deco3.wrapper的内存地址=deco3(index)
# def index():
#     pass


def outter1(func):
    print("outter1")
    def inner(*args, **kwargs):
        print("====outter1 start====")
        func(*args, **kwargs)
        print("====outter1 end====")
    return inner


def outter2(func):
    print("outter2")
    def inner(*args, **kwargs):
        print("====outter2 start====")
        func(*args, **kwargs)
        print("====outter2 end====")
    return inner

@outter1
@outter2
def f():
    print("****执行完毕****")

f()


'''运行结果：
outter2
outter1
====outter1 start====
====outter2 start====
****执行完毕****
====outter2 end====
====outter1 end====

'''
# 装饰器函数执行的先后顺序是离原函数越近越先执行，它会一层一层的运行，外层运行完毕后再运行内层，内层outter2执行完毕后，outter1又在outter2基础上再运行