pyqt/model-views/todo_skeleton.py

import sys

from PyQt5.QtWidgets import QApplication, QMainWindow

from MainWindow import Ui_MainWindow


class MainWindow(QMainWindow, Ui_MainWindow):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.setupUi(self)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())