PyQT6 (5)object has no attribute

报错

在PyQt5里创建的是MainWindow还是Widget？，如下图是两种不同窗口，创建的元素一定要调用正确。

创建的是Dialog


import sys
from PyQt6 import QtWidgets
from PyQt6.QtWidgets import QApplication, QDialog
import Ui_SeismicPro

    
if __name__ == '__main__':
    app = QApplication(sys.argv)

    MainWindow = QDialog()
    ui = Ui_SeismicPro.Ui_SeismicProgramme()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec())

创建的是MainWindow


import sys
from PyQt6 import QtWidgets
from PyQt6.QtWidgets import QApplication, QDialog
import Ui_SeismicPro

    
if __name__ == '__main__':
    app = QApplication(sys.argv)

    # MainWindow = QDialog()
    # ui = Ui_SeismicPro.Ui_SeismicProgramme()
    # 在pyqt中创建的是MainWindow，不是Widget或者dialog
    MainWindow=QtWidgets.QMainWindow()
    ui = Ui_SeismicPro.Ui_SeismicProgramme()

    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec())