code: def removeColumns(self, columnNames):
          
          model = self.tableView.model()
  
          if model is not None:
              model.removeDataFrameColumns(columnNames)
  
          self.removeColumnButton.setChecked(False)
docs: Removes one or multiple columns from the model.
  
          This method is also a slot.
  
          Args:
              columnNames (list): A list of columns, which shall
                  be removed from the model.