如何在Python/Tkinter中找出画布项的大小？

canvas = tk.Canvas()

width_config = canvas.config
height_config = canvas.config

print("画布窗口宽度：", width_config['width'])
print("画布窗口高度：", height_config['height'])

canvas = tk.Canvas()
canvas_item = canvas.create_rectangle(10, 10, 20, 20)
canvas_item_width = canvas.itemconfig(canvas_item, width=200)
canvas_item_height = canvas.itemconfig(canvas_item, height=200)
print("矩形的大小: x = ", canvas_item_width['x'] , 'y = ', canvas_item_height['y'] , 'w = ', canvas_item_width['width'] , 'h = ', canvas_item_height['height'])

矩形的大小: x =  20 y = 20 w =  2245 h =  2245