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这是我用Python写的弹球游戏，大佬能帮我检查下出了什么问题吗？

from tkinter import *
import random
import time


class Ball:
    def __init__(self,cv,paddle,color):
        self.canvas = cv
        self.paddle = paddle
        self.id = cv.create_oval(10,10,25,25,fill = color)
        self.canvas.move(self.id,200,100)
        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 hit_paddle(self,pos):
        paddle_pos = self.canvas.coords(self.paddle.id)
        if pos[2] >= paddle_pos[0] and pos[0] <= paddle_pos[2]:
            if pos[3] >= paddle_pos[1] and pos[3] <= paddle_pos[3]:
                return True
        return False


    def draw(self):
        self.canvas.move(self.id,self.x,self.y)
        pos = self.canvas.coords(self.id)
        if pos[0] <= 0:
            self.x = 3
        if pos[2] >= self.canvas_width:
            self.x = -3
        if self.hit_paddle(pos) == True:
            self.y = -3
        if pos[1] <= 0:
            self.y = 3
        if pos[3] >= self.canvas_height:
            self.y = -3


class Paddle:
    def __init__(self,cv,color):
        self.canvas = cv
        self.id = cv.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


root = Tk(className = "弹球游戏")
root.resizable(0,0)