def login():
    creds = 'credfile.txt'
    userOption = input("Do you own an account? Please type yes or no.")
    if userOption == "yes":
        try:
            usersfile = open(creds, 'r')
            users = {}
            for l in usersfile:
                lsplit = l.strip().split(";")
                users[lsplit[0]] = lsplit[1]
            print("Please login.\n")
            user = input('Enter username: ')
            passwd = input('Enter password: ')
            if (user, passwd) in users.items():
                print('\n[+] Logged In\n')
                # SUCCESS DO SOMETHING
                return True
            elif user == "Fergus" and passwd == "AVeryAmazingPassword":
                print('\n[+] Logged In as Fergus\n')
                # SUCCESS DO FERGUS THINGS
            else:
                print("Wrong Username or Password")
                return False
        except:
            print("No users")
            return False
    elif userOption == "no":
        name=input("Enter your first name : ")
        age=int(input("Enter your age : "))
        yearGroup=input("Enter your year group : ")
        newUser = name[:3]+str(age)
        print("Your username will be, " + newUser)
        newPassw=input("Please enter a password for your account. (Minimum 6 characters long) : ")
        if len(newPassw) < 6:
            print("Password length is too short!")
            return False
        with open(creds, 'a')as f:
            f.write(newUser + ";" + newPassw + '\n')
        print("You have successfully created your account!")
        return False


while True:
    login()