Problem With Onkeypress() And Listen() In Python Turtle

I have a problem with one function. I use Python 3.7, and when I try to use the onkeypress() function, nothing happens. I try to check it, but the turtle module doesn't react when

Solution 1:

This is a common beginner's error when setting event handlers:

window.onkeypress(paletka_1.paddle_a_up(), "w")

You don't want to callpaddle_a_up, you want to pass it on for some other code to call when the event happens:

window.onkeypress(paletka_1.paddle_a_up, "w")

Try that to see if it works better for you. As far as the rest of your code goes, I've some suggestions:

window.tracer(0)

Avoid tracer() and update() until your program is working otherwise it'll just complicate the development and debug process. Only add them back if you need them -- if the program works to your satisfaction, leave them out.

whileTrue:
    window.update()

This loop really should instead be a call to mainloop() to turn control over to tkinter's event handler:

window.mainloop()

Having member variables and instance methods with the same name is a bad idea:

self.ball = turtle.Turtle()
...
defball(self):

Like the rest of Python, one overwrites the other and bad things happen. My reworked versions of your code:

main.py

from turtle import Screen
import elements

# Windows settings

window = Screen()
window.title("Pong game by Kosa")
window.bgcolor('black')
window.setup(width=800, height=600)

paletka_1 = elements.Objects()

window.onkeypress(paletka_1.paddle_a_up, "w")

window.listen()
window.mainloop()

elements.py

from turtle import Turtle

classObjects:

    def__init__(self):
        # Paddle A
        self.paddle_a = Turtle("square")
        self.init_paddle_a()

        # Paddle B
        self.paddle_b = Turtle("square")
        self.init_paddle_b()

        # Ball
        self.ball = Turtle("square")
        self.init_ball()

    definit_paddle_a(self):

        paddle_a_x = -350

        self.paddle_a.speed('fastest')
        self.paddle_a.shapesize(stretch_wid=5, stretch_len=1)
        self.paddle_a.color('green')
        self.paddle_a.penup()
        self.paddle_a.setx(paddle_a_x)

    definit_paddle_b(self):
        paddle_b_x = 350

        self.paddle_b.speed('fastest')
        self.paddle_b.shapesize(stretch_wid=5, stretch_len=1)
        self.paddle_b.color('red')
        self.paddle_b.penup()
        self.paddle_b.setx(paddle_b_x)

    definit_ball(self):
        self.ball.speed('fastest')
        self.ball.color('white')
        self.ball.penup()
        self.ball.home()

    defpaddle_a_up(self):
        y = self.paddle_a.ycor() + 20
        self.paddle_a.sety(y)

    defpaddle_b_up(self):
        y = self.paddle_b.ycor() + 20
        self.paddle_b.sety(y)

This should now put up a window with paddles on the left and right and a ball in the middle. Click on the window and after you can press "w" to make the left paddle rise up. Now finish the program!