[Solved] pyqt5 ‘QWidget’ object has no attribute ‘setCentralWidget’

When I first used pyqt5, the following errors occurred during my operation:

pyqt5 ‘QWidget’ object has no attribute ‘setCentralWidget’

I used a method to solve this error:

In the running main function, it was originally like this

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    widgets = QtWidgets.QWidget()
    ui = MainWin()
    ui.main_ui.setupUi(widgets)
    widgets.show()
    ui.run_function()
    sys.exit(app.exec_())

Then modify it as follows:

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    widgets = QtWidgets.QMainWindow()
    ui = MainWin()
    ui.main_ui.setupUi(widgets)
    widgets.show()
    ui.run_function()
    sys.exit(app.exec_())

In addition to this method, there are several other methods on stack overflow that I don’t know if they are feasible:

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent=parent)
        ui = Ui_MainWindow()
        ui.setupUi(self)
 
 
import sys
 
if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent=parent)
        self.setupUi(self)
 
 
 
import sys
 
if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

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