I am currently programming a Pong game in Python. For this, I am using the Python Turtle module. In the Pong game, the main idea is that there are two paddles (one on the left, one on the right) that hit a ball back and forth between them. This is the current state, which is running without any issues:

main.py: 

from day22.game_screen import GameScreen
from day22.paddle import Paddle

game_screen = GameScreen()
screen = game_screen.get_screen()

right_paddle = Paddle((350, 0))
left_paddle = Paddle((-350, 0))

screen.listen()
screen.onkey(key="Up", fun=right_paddle.go_up)
screen.onkey(key="Down", fun=right_paddle.go_down)
screen.onkey(key="w", fun=left_paddle.go_up)
screen.onkey(key="s", fun=left_paddle.go_down)

game_is_on = True
while game_is_on:
    screen.update()

screen.exitonclick()

paddle.py:
# some code to handle the initialization of the paddles...

game_screen.py:

from turtle import Screen

class GameScreen:
    def __init__(self):
        self.screen = Screen()
        self.screen.bgcolor("black")
        self.screen.setup(width=800, height=600)
        self.screen.title("Pong")
        self.screen.tracer(0)

    def get_screen(self):
        return self.screen

I wanted to refactor the code so that the GameScreen class inherits from the Screen class of the Turtle module. This would also make the get_screen() method redundant. So, I did the following refactoring:

game_screen.py:

from turtle import Screen

class GameScreen(Screen):
    def __init__(self):
        super().__init__()
        self.bgcolor("black")
        self.setup(width=800, height=600)
        self.title("Pong")
        self.tracer(0)

main.py:

from day22.game_screen import GameScreen
from day22.paddle import Paddle

game_screen = GameScreen()

right_paddle = Paddle((350, 0))
left_paddle = Paddle((-350, 0))

game_screen.listen()
game_screen.onkey(key="Up", fun=right_paddle.go_up)
game_screen.onkey(key="Down", fun=right_paddle.go_down)
game_screen.onkey(key="w", fun=left_paddle.go_up)
game_screen.onkey(key="s", fun=left_paddle.go_down)

game_is_on = True
while game_is_on:
    game_screen.update()

game_screen.exitonclick()

When I run this code now, I get the following error: TypeError: function() argument 'code' must be code, not str. Is the reason for the error that the Screen class in the Turtle module is marked as a singleton and therefore cannot be inherited from, or am I making another mistake?