Связь классов в MVC

from PyQt5.QtWidgets import QWidget, QMainWindow from PyQt5 import uic from model.CommandButton import CommandButton
 
class MainWindow(QMainWindow):
    def __init__(self, controller):
        super().__init__()
        self.controller = controller
        uic.loadUi('view/firstform.ui', self)
        button_slide_show = CommandButton(self.slide_show_btn, self.controller)
        button_editor = CommandButton(self.editor_btn, self.controller)
        button_add_slide = CommandButton(self.add_slide_btn, self.controller)
        button_remove_slide = CommandButton(self.remove_slide_btn, self.controller)
 
class EditorWindow(QWidget):
    def __init__(self, controller):
        super().__init__()
        self.controller = controller
        uic.loadUi('view/secondform.ui', self)
        button_add_text_to_slide = CommandButton(self.add_text_btn, self.controller)
        button_add_image_to_slide = CommandButton(self.add_image_btn, self.controller)
 
 
class SlideShowWindow(QWidget):
    def __init__(self, controller):
        super().__init__()
        self.controller = controller
        uic.loadUi('view/slideshow.ui', self)
        button_back = CommandButton(self.back_btn, self.controller)
        button_next = CommandButton(self.editor_btn, self.controller)
        button_end_presentation= CommandButton(self.end_presentation_btn, self.controller)
 
Model:
class CommandButton:
    def __init__(self, qbutton, controller):
        self.qbutton = qbutton
        self.controller = controller
        self.qbutton.clicked.connect(lambda x: self.pressed())
 
    def pressed(self):
        print(self.qbutton.text())
        self.controller.execute(self.qbutton.text())
controller:
class Controller:
    def __init__(self):
        self.current_command = None
    def execute(self, command_name):
        print('executing')
        self.current_command = command_name
        if 'Слайд-шоу' == self.current_command:
            self.slide.show()
        elif 'Редактор' == self.current_command:
            self.editor.show()
запуск самого приложения:
import sys
 
from PyQt5.QtWidgets import QApplication
 
from controller.Controller import Controller
from view.main_view import MainWindow
 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    controller = Controller()
    main_view = MainWindow(controller)
    main_view.show()
    sys.exit(app.exec_())