python implementation of a bouncing ball

 from tkinter import Tk
 import tkinter
 import random
 import time
 def main():
 
 #Creating Tk objects
 tk = ()
 # Window named "Ball" #
  ("Ball")
 #. Notify the window manager to resize the layout,0,0 means it can't be pulled up
  (0,0)
 # Create an interface of length 400*500, with the default background color.
 tk.wm_attributes("-topmost",1)
 canvas = (tk, width=500, height=400, bd=0)
 # Notification Window Manager Registration Component
 ()
 # Refresh the interface
 ()

class Ball():
 #Note: The special method "init" has two underscores, and the first argument is always self.
 # Since classes can act as templates, instances can be created with the
 # Force in some properties that we think must be bound. This is accomplished by defining a
 # special init method that binds the canvas, color, etc. to the instance when it's created
 def __init__(self,canvas,paddle,color):  
   = canvas
  # missing this line, keeps reporting error 'Ball' object has no attribute 'paddle'
   = paddle
   = canvas.create_oval(10,10,25,25,fill=color)
  (,245,100)

  starts=[-3,-2,-1,-1,1,1,2,3]
  (starts)
   = starts[0]# Take a random one from the list
   = -2#-2 represents the speed of y-axis motion
  self.canvas_height = .winfo_height()
  self.canvas_width = .winfo_width()
  self.hit_bottom = False # Set the initial value of hit_bottom to false
  
  
 def hit_paddle(self,pos):
  paddle_pos = ()
  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):
  # (,0,-1) # indicates upward motion
  (,,)#,,
  pos = ()
  if pos[0]<=0:
    = 2
  if pos[1]<=0:
    = 2
  # If the ball touches the right side of the canvas, change the speed to 2 pixels to the left each time.
  if pos[2]>=self.canvas_width:
    = -2
  #Returns hit_bottom as True if the ball touches the bottom of the canvas.
  if pos[3]>=self.canvas_height: 
   self.hit_bottom = True
   
  #To determine if the ball has hit the board
  if self.hit_paddle(pos) == True:
    = -3

#How do I add the ability to move the board a bit with a keystroke?
class Paddle:
 def turn_left(self, evt):
   = -2
 def turn_right(self, evt):
   = 2
  
 def __init__(self,canvas,color):
   = canvas
   = canvas.create_rectangle(0,0,150,10,fill=color)
  (,200,300)
   = 0
  self.canvas_width = .winfo_width()
  .bind_all('<KeyPress-Left>',self.turn_left)
  .bind_all('<KeyPress-Right>',self.turn_right)
  
 def draw(self):
  (,,0)
  pos = ()
  if pos[0] <= 0:
    = 0
  if pos[2] >= self.canvas_width:
     = 0
   


paddle = Paddle(canvas,"blue")
ball = Ball(canvas,paddle,"red")
while 1:
 if ball.hit_bottom==False: #Execute the following statement if the bottom is not touched
  () # Call the ball object's function draw()
  ()# Call the paddle object's function draw()
  tk.update_idletasks() 
  () #Update the framework
  (0.01) #Sleep 0.01 seconds
 elif ball.hit_bottom==True: # If the ball touches the bottom
  canvas.create_text(200,100,text='Aha,you lose it,\nHow about try again?',font=('Times',22)) # Create text '...' at (200, 100) coordinates , font size 22
  () #Updates
 
()
main()