code: def margin_area_LinesNumbers_widget(self, value):
          
  
          if value is not None:
              assert type(value) is LinesNumbers_QWidget, \
                  "'{0}' attribute: '{1}' type is not 'LinesNumbers_QWidget'!".format("checked", value)
          self.__margin_area_LinesNumbers_widget = value
docs: Setter for **self.__margin_area_LinesNumbers_widget** attribute.
  
          :param value: Attribute value.
          :type value: LinesNumbers_QWidget