[Python] Inheritance from Python turtle screen

I'm just trying to implement a pong game with turtle. My code consist of two files:

1. main.py:

from playground import Playground
from rocket import Rocket
from ball import Ball
from score import Score
TBL_WID = 600
TBL_HEI = 500
ROCK_LEN = 50

table = Playground(TBL_WID, TBL_HEI, rock_p, rock_c, score_p, score_c, ball)
rock_p = Rocket(TBL_WID, TBL_HEI, ROCK_LEN)
rock_c = Rocket(TBL_WID, TBL_HEI, ROCK_LEN)
score_p = Score(TBL_WID, TBL_HEI)
score_c = Score(TBL_WID, TBL_HEI)
ball = Ball()
game_on = True

while game_on:
table.rock_ball_hit()

1. playground.py

from turtle import Screen, Turtle

class Playground(Screen):
def __init__(self, w, h, rock_p, rock_c, score_p, score_c, ball):
super().__init__()
self.w = w
self.h = h
self.rock_p = rock_p
self.rock_c = rock_c
self.score_p = score_p
self.score_c = score_c
self.ball = ball
self.bgcolor("black")
self.screensize(w, h)
draw_mid_line()

def draw_mid_line(self):
mid_line = Turtle()
mid_line.pensize(20)
mid_line.pencolor("white")
mid_line.penup()
mid_line.goto(0,self.h-10)
mid_line.setheading(270)
mid_line.pendown()

for step in range(self.h/(2*10)):
mid_line.forward(10)
if min_line.pencolor() == 'white':
min_line.pencolor('black')
else:
min_line.pencolor('white')

def rock_ball_hit(self, rock):
return all([abs(ball.xcor()-rock.xcor()) < 10 , abs(ball.ycor()-rock.ycor()) < 15])


but when I run main.py it throws following error:

Traceback (most recent call last):
File "E:/Python_Projects/Pong/main.py", line 1, in <module>
from playground import Playground
File "E:\Python_Projects/Pong\playground.py", line 5, in <module>
class Playground(Screen):
TypeError: function() argument 'code' must be code, not str


I asked gemini but it couldn't figure out the problem.

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