如何使用python 3.8在tkinter的画布中创建滚动条

from tkinter import *

root = Tk()
canvas = Canvas(root)

scrollbar = Scrollbar(root, orient="vertical", command=canvas.yview)
canvas.configure(yscrollcommand=scrollbar.set)

scrollbar.pack(side="right", fill="y")
canvas.pack(side="left", fill="both", expand=True)

frame = Frame(canvas)
canvas.create_window((0, 0), window=frame, anchor="nw")

# 添加需要滚动的内容
# 例如，添加标签
label = Label(frame, text="这是一个标签")
label.pack()

frame.update_idletasks()
canvas.configure(scrollregion=canvas.bbox("all"))

root.mainloop()