Writing open file code after converted UI file to Python - QTabWidget

Question

First I created UI file using QT Designer, in that main window I added QTabWidget with 4 tabs. In first tab I added Line edit and pushbutton to select the file, please look below:

Later I converted UI file to python file:

class Ui_MainWindow(object):

def setupUi(self, MainWindow):
    MainWindow.setObjectName("Application")
    MainWindow.setWindowIcon(QtGui.QIcon("ldp.png"))
    MainWindow.resize(1393, 704)
    self.centralwidget = QtWidgets.QWidget(MainWindow)
    self.centralwidget.setObjectName("centralwidget")
    self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
    self.verticalLayout.setObjectName("verticalLayout")
    self.gridLayout = QtWidgets.QGridLayout()
    self.gridLayout.setObjectName("gridLayout")
    self.widget = QtWidgets.QWidget(self.centralwidget)
    self.widget.setStyleSheet("\n"
    "background-color: rgb(141, 141, 141);")
    self.widget.setObjectName("widget")
    self.gridLayout.addWidget(self.widget, 0, 0, 1, 1)

    #Data_Tab:
    self.tabWidget = QtWidgets.QTabWidget(self.centralwidget)
    self.tabWidget.setObjectName("tabWidget")
    self.Data_Tab = QtWidgets.QWidget()
    self.Data_Tab.setObjectName("Data_Tab")

    self.vLayout = QtWidgets.QVBoxLayout(self.Data_Tab)
    self.hLayout = QtWidgets.QHBoxLayout()
    self.Line_Edit = QtWidgets.QLineEdit(self.Data_Tab)
    self.hLayout.addWidget(self.Line_Edit)
    self.select_File = QtWidgets.QPushButton(“Select File”, self.Data_Tab)
    self.hLayout.addWidget(self.select_File)
    self.vLayout.addLayout(self.hLayout)
    self.select_File.clicked.connect(self.loading)

 .....      
  
 def loading(self):
    fileName, _ = QtWidgets.QFileDialog.getOpenFileName(self, "Open File", "C:/", "CSV Files 
    (*.csv)");
    self.Line_Edit.setText(fileName)

Above code looks fine, but when I click select file button after running the code. I am not getting the open file window instead application getting closed automatically with out any error.

Even I tried with Mainwindow, object, Ui_Mainwindow instead of passing argument as self. But no use. Could any one please suggest me where I did wrong.

Note: I added only required code here, not complete code.

Answer 1

Finally I got the answer. Thanks for your suggestions @eyllanesc, @paulM

I did below changes in loading function:

   def loading(self):
        options = QtWidgets.QFileDialog.Options()
        fileName, _ = QtWidgets.QFileDialog.getOpenFileName(None, "Open File", "C:/", 
               "CSV Files (*.csv)", options=options);

Earlier, I did not use file dialog options and also instead of None, passed self. Now, I changed it and my code is working fine.