from PySide6.QtWidgets import QApplication, QMainWindow
from main_wnd import Ui_MainWindow

class MainWnd(QMainWindow, Ui_MainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.setupUi(self)

        self.label.setText(self.tr("Test label"))


def main():
    app = QApplication()
    wnd = MainWnd()
    wnd.show()
    return app.exec()


if __name__ == '__main__':
    main()