如何使用Tkinter和函数找到选中的复选按钮？

import tkinter as tk

def get_selected_checkboxes():
    selected_checkboxes = []
    for checkbox, var in checkboxes.items():
        if var.get() == 1:
            selected_checkboxes.append(checkbox)
    return selected_checkboxes

def print_selected_checkboxes():
    selected_checkboxes = get_selected_checkboxes()
    print("Selected checkboxes:", selected_checkboxes)

root = tk.Tk()

checkboxes = {}

# 创建复选按钮
checkbox1_var = tk.IntVar()
checkbox1 = tk.Checkbutton(root, text="复选按钮1", variable=checkbox1_var)
checkbox1.pack()
checkboxes[checkbox1] = checkbox1_var

checkbox2_var = tk.IntVar()
checkbox2 = tk.Checkbutton(root, text="复选按钮2", variable=checkbox2_var)
checkbox2.pack()
checkboxes[checkbox2] = checkbox2_var

checkbox3_var = tk.IntVar()
checkbox3 = tk.Checkbutton(root, text="复选按钮3", variable=checkbox3_var)
checkbox3.pack()
checkboxes[checkbox3] = checkbox3_var

# 创建按钮，点击时打印选中的复选按钮
button = tk.Button(root, text="打印选中的复选按钮", command=print_selected_checkboxes)
button.pack()

root.mainloop()