import tkinter, time

def nakresli_lopticku():
    x = 10
    y = 10
    for i in range(1000):
        canvas.delete(tkinter.ALL)
        canvas.create_oval(x, y, x+60, y+60,width=5,fill="green")
        canvas.update() # aby sa kruh hneď ukázal
        #canvas.
        time.sleep(0.1)
        x += 60
        x = x % 1000

canvas = tkinter.Canvas(height = 300, width = 1000)
canvas.pack()

nakresli_lopticku()