from tkinter import *
root = Tk()
c = Canvas(root, width=200, height=80, bg="green")
c.pack()
ball = c.create_oval(10, 30, 30, 50, fill='yellow')
def motion():
  c.move(ball, 1, 0)
  if c.coords(ball)[2] < 200:
    root.after(10, motion)
motion()
root.mainloop()