code: def createEditor(self, parent, option, index):
          
          # close all editors
          self.close_editors()
          e = self.create_editor_widget(parent, option, index)
          if e:
              self._edit_widgets[index] = e
              e.setAutoFillBackground(True)
              e.destroyed.connect(partial(self.editor_destroyed, index=index))
          return e
docs: Return the editor to be used for editing the data item with the given index.
  
          Note that the index contains information about the model being used.
          The editor's parent widget is specified by parent, and the item options by option.
  
          This will set auto fill background to True on the editor, because else, you would see
          The rendered delegate below.
  
          :param parent: the parent widget
          :type parent: QtGui.QWidget
          :param option: the options for painting
          :type option: QtGui.QStyleOptionViewItem
          :param index: the index to paint
          :type index: QtCore.QModelIndex
          :returns: The created widget | None
          :rtype: :class:`QtGui.QWidget` | None
          :raises: None