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_())