Как вызвать метод из другого класса в pyqt5 python?

Question

, когда я пытаюсь получить функцию из другого класса [Excute Secon dry PyQt5Window], появляется следующая ошибка - т.е. то есть: когда вызов метода copy_action из класса MainApp для использования в классе Uploud_Files показывает, что произошла эта ошибка:

 Traceback (most recent call last):
      File "index.py", line 75, in Apply
        self.mainapp.copy_action()
      File "index.py", line 333, in copy_action
        original_pathes =self.dialog.original_path(self)
    RuntimeError: super-class __init__() of type MainApp was never called

класс Uploud_Files

    class Uploud_Files(QMainWindow,uploud_files):
        def __init__(self, parent=None):
            super(Uploud_Files, self).__init__(parent)
            QMainWindow.__init__(self)
            self.setupUi(self)
            self.Handle_Buttoms()
            self.UI_Changes()
            self.mainapp=MainApp(self,init_or_dont=0)####Here to access MainApp Class


        def Handle_Buttoms(self):
            self.pushButton_2.setCheckable(True)
            self.pushButton_2.clicked.connect(self.uploud)
            self.pushButton_3.clicked.connect(self.Apply)


        def UI_Changes(self):
           header = self.tableWidget.horizontalHeader()
           header.setSectionResizeMode(0,QHeaderView.ResizeToContents)
           header.setSectionResizeMode(1,QHeaderView.ResizeToContents)


        def uploud(self):
            try:
                global original
                fileNames = QFileDialog.getOpenFileNames(self, 'uploud Images', '.', 'All Files (*.*)')
                original = fileNames[0]
            except Exception:
                pass
            self.tableWidget.setRowCount(0)
            try:
                orignal_filename_path = [(path, os.path.basename(path)) for path in original]
                data = orignal_filename_path
                for row, form in enumerate(data):
                    row_position = self.tableWidget.rowCount()
                    self.tableWidget.insertRow(row_position)
                    for col, item in enumerate(form):
                        self.tableWidget.setItem(row, col, QTableWidgetItem(str(item)))
                        col += 1
            except Exception:
                pass

        def original_path(self):
            if self.pushButton_2.isChecked():
                global original
                return original
            else:
                original = 0
                return original

        def Apply(self):
            QMessageBox.information(self, 'Note', 'Please Press Create Visit')
            self.close()
            self.mainapp.copy_action() # Error Happend Here 

часть класса MainApp

    class MainApp(QMainWindow , ui):
        def __init__(self , parent=None ,init_or_dont=1):
            self.init_or_dont = init_or_dont
            if self.init_or_dont:
                super(MainApp, self).__init__(parent)
                QMainWindow.__init__(self)
                self.setupUi(self)
                self.UI_Changes()
                self.Connect_DB()
                self.dialog = Uploud_Files(self) # its working When call uploud_Files Class

    def copy_action(self):

    original_pathes =self.dialog.original_path(self) # its working When call uploud_Files Class