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My code is as below; it should draw random colour and size circles repeatedly, but only draws one. I have tried countless combinations of mainloop() and window1.update() but always have the same problem. 

#!/usr/bin/env python3
from tkinter import *
from random import *
WIDTH = 1024/2
HEIGHT = 720/2
window1 = Tk()
c1 = Canvas(window1, width=WIDTH, height=HEIGHT, bg='#FFFFFF')
c1.pack()
colours = ('#FF0000', '#00FF00', '#0000FF', '#FFFF00', '#FF00FF')
while 3 == 3:
    colchose = choice(colours)
    x0 = randint(0, WIDTH)
    y0 = randint(0, HEIGHT)
    c1.create_oval(x0, y0, x0+d, y0+d, fill=colchose)
    mainloop()
That1Guy
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Oliver
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1 Answers1

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The problem is your mainloop() call in the last line. This call will end, once the whole program has terminated.
I would suggest you to look at the threading facilities of Python. You could create another thread that draws onto the canvas while the mainloop is executing.