import tkinter
canvas=tkinter.Canvas(height="400", width="400", bg="papayawhip")
canvas.pack()

from random import *
for i in range(20):
    Xsur = randint(100,300)
    Ysur = randint(100,300)
    canvas.create_rectangle(Xsur-10, Ysur-10, Xsur+10, Ysur+10, fill='blue', outline='yellow', width=5)
    canvas.create_text(Xsur-10, Ysur-10, text=i)
    canvas.after(100)
    canvas.update()