Tk main window with cement framework

window.py

import tkinter as tk
from . import darktheme


class MainWindow(tk.Tk):

    def __init__(self):

        super().__init__()

        self.app = None

    def _setup(self, app):

        self.app = app

        darktheme.setup(self)
        self.protocol("WM_DELETE_WINDOW", self.quit)

        app.extend('mainwindow', self)

    @property
    def log(self):

        return self.app.log