docs: def set_class_name(self) -> 'PygalleBaseClass':
          """ Store the class name of the current instance of
          :class:`PygalleBaseClass` into internal property.
  
          # Returns:
              PygalleBaseClass: An instance of :class:`PygalleBaseClass`
          """
          return self.set_internal(PygalleBaseClass.__KEYS.CLASSNAME, self.__class__.__name__)