如何在Tkinter GUI中应用滚动条？

from tkinter import *
from tkinter import ttk

root = Tk()
scrollbar = Scrollbar(root)
scrollbar.pack(side=RIGHT, fill=Y)

canvas = Canvas(root, yscrollcommand=scrollbar.set)
frame = Frame(canvas)
scrollbar.config(command=canvas.yview)

canvas.pack(side=LEFT, fill=BOTH, expand=True)
canvas.create_window(0, 0, window=frame, anchor=NW)

# 示例：添加标签到框架中
for i in range(50):
    label = Label(frame, text="Label " + str(i))
    label.pack()

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

root.mainloop()