如何在运行代码后保持打开Tkcalendar

import tkinter as tk
from tkcalendar import Calendar

window = tk.Tk()
window.title("Tkcalendar Example")

def open_calendar():
    def get_selected_date():
        selected_date = cal.get_date()
        print("Selected Date:", selected_date)
        top.destroy()

    top = tk.Toplevel(window)
    cal = Calendar(top, selectmode="day")
    cal.pack()

    select_button = tk.Button(top, text="Select", command=get_selected_date)
    select_button.pack()

open_button = tk.Button(window, text="Open Calendar", command=open_calendar)
open_button.pack()

window.mainloop()

import tkinter as tk
from tkcalendar import Calendar

window = tk.Tk()
window.title("Tkcalendar Example")

def open_calendar():
    def get_selected_date():
        selected_date = cal.get_date()
        print("Selected Date:", selected_date)
        top.destroy()

    top = tk.Toplevel(window)
    cal = Calendar(top, selectmode="day")
    cal.pack()

    select_button = tk.Button(top, text="Select", command=get_selected_date)
    select_button.pack()

open_button = tk.Button(window, text="Open Calendar", command=open_calendar)
open_button.pack()

window.mainloop()