Bounce game paddle problems

[SheeppOSU]

I cant move the paddle in this game and yes i am focused on the game screen when i press the left and right arrow. Also there is no error message. I am doing the bounce game from the python book. I didn't see anything wrong it.video of program In this video you can't see it but im pushing down the arrows.

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import time import random from tkinter import *   class Ball:     def __init__(self, canvas, color):         self.canvas = canvas         self.id = canvas.create_oval(10, 10, 25, 25, fill=color)         self.canvas.move(self.id, 245, 100)         starts = [-3, -2, -1, 1, 2, 3]         random.shuffle(starts)         self.x = starts[0]         self.y = -3         self.canvas_height = self.canvas.winfo_height()         self.canvas_width = self.canvas.winfo_width()               def draw(self):         self.canvas.move(self.id, self.x, self.y)         pos = self.canvas.coords(self.id)         if pos[1] <= 0:             self.y = 1         if pos[3] >= self.canvas_height:             self.y = -1         if pos[0] <= 0:             self.x = 3         if pos[2] >= self.canvas_width:             self.x = -3   class Paddle:     def __init__(self, canvas, color):         self.canvas = canvas         self.id = canvas.create_rectangle(0, 0, 100, 10, fill=color)         self.canvas.move(self.id, 200, 300)         self.x = 0         self.canvas_width = self.canvas.winfo_width()         self.canvas.bind_all('KeyPress-Left', self.turn_left)         self.canvas.bind_all('KeyPress-Right', self.turn_right)       def draw(self):         self.canvas.move(self.id, self.x, 0)         pos = self.canvas.coords(self.id)         if pos[0] <= 0:             self.x = 0         elif pos[2] >= self.canvas_width:             self.x = 0       def turn_left(self, evt):         self.x = -2       def turn_right(self, evt):         self.x = 2           tk = Tk() tk.title("Game") tk.resizable(0, 0) tk.wm_attributes("-topmost", 1) canvas = Canvas(tk, width=400, height=400, bd=0, highlightthickness=0) canvas.pack() tk.update()   paddle = Paddle(canvas, 'blue') ball = Ball(canvas, 'red')   while 1:         ball.draw()         paddle.draw()         tk.update_idletasks()         tk.update()         time.sleep(0.01)

[woooee]

General, simple debugging would be to print self.x in the Paddle class, draw function before this line

1	self.canvas.move(self.id, self.x, 0)

[SheeppOSU]

I don't get what you mean by that

[woooee]

printing variables is straight forward and one way to find errors. What was printed when you added the print statement at the specified place?

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## add the print statement in this function     def draw(self):         self.canvas.move(self.id, self.x, 0)         pos = self.canvas.coords(self.id)         if pos[0] <= 0:             self.x = 0         elif pos[2] >= self.canvas_width:             self.x = 0

[SheeppOSU]

it was printing 0 over and over again