sometimes destroy is called twice if this is idle s last window then quit the mainloop needed for clean exit on windows 98 subclass can override this can happen when the window menu was torn off simply ignore it sometimes destroy is called twice if this is idle s last window then quit the mainloop needed for clean exit on windows 98 subclass can override this can happen when the window menu was torn off simply ignore it
from tkinter import Toplevel, TclError
import sys


class WindowList:

    def __init__(self):
        self.dict = {}
        self.callbacks = []

    def add(self, window):
        window.after_idle(self.call_callbacks)
        self.dict[str(window)] = window

    def delete(self, window):
        try:
            del self.dict[str(window)]
        except KeyError:
            
            pass
        self.call_callbacks()

    def add_windows_to_menu(self,  menu):
        list = []
        for key in self.dict:
            window = self.dict[key]
            try:
                title = window.get_title()
            except TclError:
                continue
            list.append((title, key, window))
        list.sort()
        for title, key, window in list:
            menu.add_command(label=title, command=window.wakeup)

    def register_callback(self, callback):
        self.callbacks.append(callback)

    def unregister_callback(self, callback):
        try:
            self.callbacks.remove(callback)
        except ValueError:
            pass

    def call_callbacks(self):
        for callback in self.callbacks:
            try:
                callback()
            except:
                t, v, tb = sys.exc_info()
                print("warning: callback failed in WindowList", t, ":", v)


registry = WindowList()

add_windows_to_menu = registry.add_windows_to_menu
register_callback = registry.register_callback
unregister_callback = registry.unregister_callback


class ListedToplevel(Toplevel):

    def __init__(self, master, **kw):
        Toplevel.__init__(self, master, kw)
        registry.add(self)
        self.focused_widget = self

    def destroy(self):
        registry.delete(self)
        Toplevel.destroy(self)
        
        
        if not registry.dict:
            self.quit()

    def update_windowlist_registry(self, window):
        registry.call_callbacks()

    def get_title(self):
        
        return self.wm_title()

    def wakeup(self):
        try:
            if self.wm_state() == "iconic":
                self.wm_withdraw()
                self.wm_deiconify()
            self.tkraise()
            self.focused_widget.focus_set()
        except TclError:
            
            
            pass


if __name__ == "__main__":
    from unittest import main
    main('idlelib.idle_test.test_window', verbosity=2)