Прилипчивые шарики

from tkinter import *
from random import randrange as rnd, random, choice
import time, math

root = Tk()
root.geometry('800x600')
canv = Canvas(root, bg = 'white')
canv.pack(fill=BOTH,expand=1)

colors = ['green','red','blue','yellow']



class Ball():
    def __init__(self,x,y):
        self.x = x
        self.y = y
        self.r = r = rnd(5,30)
        #self.color = choice(colors)
        self.color = "#%02x%02x%02x" % (rnd(256), rnd(256), rnd(256))
        self.pen_color = 'blue'
        self.id = canv.create_oval(x-r,y-r,x+r,y+r,fill=self.color,outline=self.pen_color,width=3)

    def paint(self):
        canv.coords(self.id,self.x-self.r,self.y-self.r,self.x+self.r,self.y+self.r)
        canv.itemconfig(self.id,fill=self.color,outline=self.pen_color)

    def kill(self):
        canv.delete(self.id)
        balls.remove(self)

    def distanceTo(self,x,y):
        return ((self.x-x)**2 + (self.y-y)**2)**0.5

def new(event=0):
    global balls
    balls = []
    canv.delete(ALL)

    for i in range(15):
        x = rnd(50,500)
        y = rnd(20,500)
        balls.append(Ball(x,y))
        x += 50

def click(event):
    global m
    print(m)
    if not m:
        for ball in balls:
            if ball.distanceTo(event.x,event.y) < ball.r:
                m = ball
    else:
        m = None

def move(event):
    if m:
        m.x = event.x
        m.y = event.y
        m.paint()

m = None

new()

canv.bind('<1>',click)
canv.bind('<Motion>',move)
canv.bind('<3>',new)

mainloop()