from PyQt6.QtWidgets import QApplication, QWidget from windows.mainwindow import MainWindow import sys # You need one (and only one) QApplication instance per application. # Pass in sys.argv to allow command line arguments for your app. # If you know you won't use command line arguments QApplication([]) works too. if __name__ == "__main__": app = QApplication(sys.argv) window = MainWindow() window.show() # IMPORTANT!!!!! Windows are hidden by default. app.exec()