code: def addRow(self, triggered):
          
          if triggered:
              model = self.tableView.model()
              model.addDataFrameRows()
              self.sender().setChecked(False)
docs: Adds a row to the model.
  
          This method is also a slot.
  
          Args:
              triggered (bool): If the corresponding button was
                  activated, the row will be appended to the end.