Create a blank pyside6 Mainwindow

import sys

from PySide6.QtWidgets import QApplication, QMainWindow

from mainForm import Ui_MainWindow


class MainWindow(QMainWindow):

    def __init__(self):
        super(MainWindow, self).__init__()
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)


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