Python: Deleting an object from a class from Tkinter

How do I delete a ball after it has been created? I created a class for a ball and have an array generating 20 balls on screen. The balls are created in random positions with random speeds. When the ball is clicked on, it is supposed to disappear. I can't seem to get this to function properly. Please help.

   from Tkinter import *
    import random
    import time
    import math
    import pygame

    canvasWidth=480
    canvasHeight=320


    root= Tk()
    canvas=Canvas(root,width=canvasWidth,height=canvasHeight, bg='white')
    root.title('RaspPi')
    canvas.pack()

    class Ball:
        def __init__(self):
                self.ballSize = 30
                self.xposition = random.randint(0 + self.ballSize, canvasWidth - self.ballSize)
                self.yposition = random.randint(0 + self.ballSize, canvasHeight - self.ballSize)
                self.shape=canvas.create_oval(self.xposition,self.yposition,self.xposition+self.ballSize,self.yposition+self.ballSize, fill='black',activefill="grey",width=0,tag="shape")
                self.xspeed=0
                self.yspeed=0
                self.ballDeleted=False
                canvas.tag_bind("shape","<Button-1>",self.ballDelete)
                while self.xspeed<=0.5 and self.xspeed>=-0.5:
                    self.xspeed = random.randrange(-3,3)
                while self.yspeed <= 0.5 and self.yspeed >= -0.5:
                    self.yspeed = random.randrange(-3,3)



        def move(self):
            canvas.move(self.shape, self.xspeed, self.yspeed)
            pos = canvas.coords(self.shape)
            if pos[2] >= canvasWidth or pos[0] <= 0:
                self.xspeed = -self.xspeed
            if pos[3] >= canvasHeight or pos[1] <= 0:
                self.yspeed = -self.yspeed

        def ballDelete(self,event):
            canvas.delete(self.shape)



    balls=[]
    for i in range(20):
        balls.append(Ball())

    while True:
        for ball in balls:
            if ball.ballDeleted==False:
                ball.move()
            else:
                balls.remove(ball)
        root.update()
        time.sleep(0.01)

    root.

mainloop()