# Tk_random_circles.py

# Tk_random_circles.py

from Tkinter import *
import random

root = Tk()
w = 640
h = 480
cv = Canvas(width=w, height=h, bg='black')
cv.pack()
colorList = ["blue", "red", "green", "white", "yellow", "magenta", "orange"]

while 1:
    x = random.randint(-20, w)
    y = random.randint(-20, h)
    r = random.randint(10, 60)
    color = random.choice(colorList)
    cv.create_oval(x, y, x+r, y+r, fill=color)
    root.update()

root.mainloop()