1.啟動程序，輸入用戶名及密碼（三次輸入機會）

2.判斷用戶名是否存在

3.判斷賬戶是否被鎖定

4.判斷用戶名密碼是否正確

5.登錄成功

代碼實現如下：

user_list = [
    (‘Kira‘,‘123‘),
    (‘Bob‘,‘456‘),
    (‘Amy‘,‘789‘),
    (‘Bettie‘,‘123‘)
]
lock_user_list = [‘Bettie‘]
count = 1
while count<=3:
    username = input("Please input your name:")
    password = input("Please input your password:")
    for index,user in enumerate(user_list):#循環儲存賬戶的列表
        #print(index,user)
        userName = user_list[index][0]#獲取用戶名
        passWord = user_list[index][1]#獲取密碼
        if userName == username: #判斷用戶名是否存在於user_list
            for index2,user in enumerate(lock_user_list): #循環鎖定賬戶列表
                lock_user = lock_user_list[index2]#獲取被鎖定用戶名
                #print(lock_user,username)
                if  lock_user != username:#判斷用戶是否被鎖定
                    if  username == userName and password == passWord:#判斷是否達成登錄成功的條件
                        print("Welcome %s !"%(username))
                        exit()
                    elif count==3 and (username !=userName or password != passWord):#判斷是否達成被鎖定的條件
                        lock_user_list.append(username)
                        print(lock_user_list)
                        print("Sorry,You have tried too many times!")
                        exit()
                else :
                    print("Sorry,your account had be locked")
                    exit()
    print("Please try again!")
    count +=1

Day01-Python寫登錄接口