"""
    Simple animation example with Python and TKinter
"""
import time
from tkinter import *
window = Tk()
canvas = Canvas(window, width=400, height=300, bg='white')
canvas.pack()
x = 0
y = 10
ball_diameter = 30
vx = 10.0
vy = 5.0     
for t in range(1, 500):
        x += vx
        y += vy
        canvas.create_oval(x, y, x+ball_diameter, y+ball_diameter, fill="blue", tag='blueball')
        canvas.update()
        time.sleep(0.05)
        canvas.delete('blueball')
window.mainloop()