# Tk_spacebar_event.py

# Tk_spacebar_event.py

from Tkinter import *
from random import *

root=Tk()
canvas=Canvas(root,width=400,height=300,bg='white')
def draw(event=None):
    canvas.delete(ALL)# clear canvas first
    canvas.create_oval(randint(1,180),randint(1,120),randint(210,399),randint(180,299),fill='red')
draw()
canvas.pack()

root.bind("<space>", draw)
root.mainloop()