errr - 経済統計練習帳

import tkinter as tk
import time
 
root = tk.Tk()
c0 = tk.Canvas(root, width = 300, height = 300)
for i in range(0,202,2):
    time.sleep(0.1)
    n = c0.create_oval(i,125,50+i,175, tags = 'o')
    c0.pack()
    c0.update()
root.mainloop()