PYTHON+PYQT5用Qfiledialog失败闪退

Question

用PYTHON+PYQT5做图象界面，运行后打不开QfileDialog文件对话窗，闪退并报“Process finished with exit code 1073741845”。尝试调用QMessageBox结果同样。

不知道是哪里出了问题，希望各位能够指教指教。谢谢！

程序如下：

# -*- coding: utf-8 -*-


# Created by: PyQt5 UI code generator 5.15.2
#



from PyQt5 import QtCore, QtGui, QtWidgets

from PyQt5.QtWidgets import QMessageBox,QFileDialog,QMainWindow,QInputDialog

import sys,os



class Ui_MainWindow(object):

    def setupUi(self, MainWindow: object) -> object:
        """

        :type MainWindow: object
        """
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        """
        ...省略窗体格式设置

        """



        # action & signal
        self.pushButton_cv_path.clicked.connect(self.btn_dir)#.cnnect(self.btn_dir)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MAIN"))

        self.label.setText(_translate("MainWindow", "选择路径"))
        self.pushButton_cv_path.setText(_translate("MainWindow", "选择路径"))


    def btn_dir(Ui_MainWindow,lineEdit_cv_path):

        fn,fileType = QtWidgets.QFileDialog.getOpenFileName(self, "选取文件", os.getcwd(),"")
        print(fn)



if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)  
    MainWindow = QtWidgets.QMainWindow()    
    ui = Ui_MainWindow()                   
    ui.setupUi(MainWindow)                  
    MainWindow.show()                       
    sys.exit(app.exec_())                 

Answer 1

把Dialog的父代设成None,其他的对象能加self就加！