使滚动条在画布tkinter上动态改变长度

import tkinter as tk
from tkinter import ttk

root = tk.Tk()
canvas = tk.Canvas(root)
canvas.pack(fill=tk.BOTH, expand=True)

scrollbar = ttk.Scrollbar(root, orient=tk.VERTICAL, command=canvas.yview)
canvas.configure(yscrollcommand=scrollbar.set)
scrollbar.pack(side=tk.RIGHT, fill=tk.Y)

frame = tk.Frame(canvas)
canvas.create_window((0, 0), window=frame, anchor=tk.NW)

def on_frame_configure(event):
    canvas.configure(scrollregion=canvas.bbox("all"))

frame.bind("<Configure>", on_frame_configure)

# 添加你想要的内容，例如文本、图像等

root.mainloop()