file = open("logindata.txt", "r")
data_list = file.readlines()
file.close()
print(data_list)


for i in range(0, len(data_list)):
        username = input("username: ")
        password = input("password: ")
        i += 1
        if i % 2 == 0:
            if data_list[i] == username and data_list[i + 1] == password:
            print("You are successfully logged in as", username)
            i == len(data_list)
        elif data_list[i] == username and data_list[i + 1] != password:
            print("The password you entered was incorrect, please try again.")
        else:   # how do i end the code if the user inputs no
            if data_list[i] != username:
                choice = input("The username you entered was not found, would you like to create an account? (Y/N)")
                if choice.upper() == "Y":
                    new_username = input("new username: ")
                    data_list.append(new_username + "n")
                    new_password = input("new password: ")
                    data_list.append(new_password + "n")
                    file = open("logindata.txt", "w")
                    file.writelines(data_list)
                    i == data_list