file_object = open(‘userdata.txt‘)
userdatadic = { }
log=0
erroruesr={}
def login():
    for line in file_object:
         line = line.strip(‘\n‘)
         userdatalist =line.split(‘---‘)
         userdatadic[userdatalist[0]] =  userdatalist[1]
#從數據庫中調用信息
    for i in range(3):
        username=input("uesrname:")
        FBItext = open(‘FBI.txt‘)
        for line in FBItext:
            line = line.strip(‘\n‘)
            if line ==username:
                print("you‘re lose too many mistakes")
                return
#判斷是否黑名單
        else:
            password=input("password:")
            for value in userdatadic.keys():
                if value==username:
                    if userdatadic[value]==password:
                        print("welcome")
                        log = 1
                        break
#對比賬號密碼
                    else:
                        for v in erroruesr.keys():
                            if v == username:
                                erroruesr[username] += 1
                                break
                        else:
                            erroruesr[username] = 1
#記錄輸出的信息
            if log == 1:
                break
    else:
        for v in erroruesr.values():
            if v>=3:
                f = open("FBI.txt", ‘a‘)
                f.write(username+"\n")
                f.close()
        print("you‘re lose too many mistakes")
#對比輸錯信息，並保存
login()

登陸界面實現輸錯3次鎖定