day17作业

# 一：编写函数，（函数执行的时间用time.sleep(n)模拟）
import time
def foo(x,y):
    time.sleep(2)
    print(x,y)
# 二：编写装饰器，为函数加上统计时间的功能
import time
def timmer(func):
    def wrapper(*args,**kwargs):
        start = time.time()
        res = func(*args,**kwargs)
        stop = time.time()
        print(stop - start)
        return res
    return wrapper
@timmer
def foo(x,y):
    time.sleep(2)
    print(x,y)

foo(1,2)
# 三：编写装饰器，为函数加上认证的功能
def login(func):
    def wrapper(*args,**kwargs):
        while True:
            username = input('请输入账号:').strip()
            userpwd = input('请输入密码:').strip()
            if username == 'yu' and userpwd != '123':
                print('登陆成功')
                res = func(*args,**kwargs)
                return res
            else:
                print('账号错误请重新输入')
                continue
    return wrapper
@login
def foo(x,y):
    time.sleep(2)
    print(x,y)
foo(1,2)
# 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
flag = False
def login(func):
    def wrapper(*args,**kwargs):
        global flag
        if not flag:
            with open('account', mode='r',encoding='utf-8') as f:
                data = f.readline()
                dic = eval(data)
            while True:
                username = input("username>>>: ").strip()
                password = input("password>>>: ").strip()
                if username == dic['name'] and dic['password'] == password:
                    flag = True  # 修改用户登录状态
                    print("登陆成功")
                    res = func(*args,**kwargs)  # 执行传入的函数
                    return res
                else:
                    print('账号密码不匹配')
                    continue
        else:
            print('已通过验证')
            func(*args,**kwargs)
    return wrapper
@login
def foo():
    print('hallo world')
@login
def fun(x,y,z):
    print(x+y+z)
foo()
fun(1,2,3)
# 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
import time,datetime
user = {'user':None,'start_time':None,'login_time':1}
def login(func):
    def wrapper(*args,**kwargs):
        if user['user']:
            time1 = (datetime.datetime.fromtimestamp(time.time()) - user['start_time']).seconds
            if time1 < int(user['login_time']):
                return func(*args, **kwargs)
            else:
                print("登录时间过长，请重新登录！")
        with open('account', mode='r',encoding='utf-8') as f:
            data = f.readline()
            dic = eval(data)
        while True:
            username = input("username>>>: ").strip()
            password = input("password>>>: ").strip()

            if username == dic['name'] and dic['password'] == password:
                print("登陆成功")
                user['user'] = username
                user['start_time'] = datetime.datetime.now()
                res = func(*args,**kwargs)  # 执行传入的函数
                return res
            else:
                print('账号密码不匹配')
                continue
    return wrapper
@login
def foo():
    print('hallo world')
@login
def fun(x,y,z):
    time.sleep(2)
    print(x+y+z)
@login
def func(x,y,z):
    time.sleep(6)
    print(x+y+z)
foo()
fun(1,2,3)
func(1,2,3)