code: def on_item_changed(self, item, new_value, row, column):
          
          return (item, new_value, row, column)
docs: Event for the item change.
  
          Args:
              emitter (TableWidget): The emitter of the event.
              item (TableItem): The TableItem instance.
              new_value (str): New text content.
              row (int): row index.
              column (int): column index.