如何在tkinter画布上交换两个对象的位置

import tkinter as tk

root = tk.Tk()
canvas = tk.Canvas(root, width=400, height=400)
canvas.pack()

rect1 = canvas.create_rectangle(50, 50, 100, 100, fill="red")
rect2 = canvas.create_rectangle(200, 200, 250, 250, fill="blue")

def swap_positions(obj1, obj2):
    x1, y1, x2, y2 = canvas.coords(obj1)
    x3, y3, x4, y4 = canvas.coords(obj2)
    
    canvas.coords(obj1, x3, y3, x4, y4)
    canvas.coords(obj2, x1, y1, x2, y2)

button = tk.Button(root, text="交换位置", command=lambda: swap_positions(rect1, rect2))
button.pack()

root.mainloop()