Tkinter -要求用户输入整数，直到用户在tkinter输入框中给出有效响应

import tkinter as tk
from tkinter import messagebox

def validate_input(new_value):
    if new_value == "":
        return True
    try:
        int(new_value)
        return True
    except ValueError:
        return False

def on_submit():
    user_input = entry.get()
    if validate_input(user_input):
        messagebox.showinfo("Success", f"You entered: {user_input}")
        root.quit()
    else:
        messagebox.showerror("Error", "Please enter a valid integer.")

root = tk.Tk()
root.title("Integer Input Validator")

entry = tk.Entry(root, validate="key", validatecommand=(root.register(validate_input), "%P"))
entry.pack(padx=20, pady=20)

submit_button = tk.Button(root, text="Submit", command=on_submit)
submit_button.pack(pady=10)

root.mainloop()