如何保存tkinter复选框和条目状态并在下次运行时加载

import tkinter as tk
from tkinter import ttk
import configparser

config = configparser.ConfigParser()
config['DEFAULT'] = {'Checkbox1': '0',
                     'Checkbox2': '0',
                     'Entry1': '',
                     'Entry2': ''}

root = tk.Tk()

checkbox1_var = tk.IntVar()
checkbox1 = ttk.Checkbutton(root, text='Checkbox 1', variable=checkbox1_var)
checkbox1.grid(row=0, column=0)

checkbox2_var = tk.IntVar()
checkbox2 = ttk.Checkbutton(root, text='Checkbox 2', variable=checkbox2_var)
checkbox2.grid(row=1, column=0)

entry1_var = tk.StringVar()
entry1 = ttk.Entry(root, textvariable=entry1_var)
entry1.grid(row=2, column=0)

entry2_var = tk.StringVar()
entry2 = ttk.Entry(root, textvariable=entry2_var)
entry2.grid(row=3, column=0)

def save_state():
    config['DEFAULT']['Checkbox1'] = str(checkbox1_var.get())
    config['DEFAULT']['Checkbox2'] = str(checkbox2_var.get())
    config['DEFAULT']['Entry1'] = entry1_var.get()
    config['DEFAULT']['Entry2'] = entry2_var.get()

    with open('config.ini', 'w') as configfile:
        config.write(configfile)

def load_state():
    config.read('config.ini')

    checkbox1_var.set(config['DEFAULT'].getint('Checkbox1'))
    checkbox2_var.set(config['DEFAULT'].getint('Checkbox2'))
    entry1_var.set(config['DEFAULT']['Entry1'])
    entry2_var.set(config['DEFAULT']['Entry2'])

save_button = ttk.Button(root, text='Save', command=save_state)
save_button.grid(row=4, column=0)

load_button = ttk.Button(root, text='Load', command=load_state)
load_button.grid(row=5, column=0)

root.mainloop()