code: def get_alias_func(base_class, nickname):
      
      register = get_register_func(base_class, nickname)
  
      def alias(*aliases):
          """alias registrator"""
          def reg(klass):
              """registrator function"""
              for name in aliases:
                  register(klass, name)
              return klass
          return reg
      return alias
docs: Get registrator function that allow aliases.
  
      Parameters
      ----------
      base_class : type
          base class for classes that will be reigstered
      nickname : str
          nickname of base_class for logging
  
      Returns
      -------
      a registrator function