code: def _error_to_jsondict(mod, type_, code):
      
      (t_name, c_name) = _get_error_names(mod, type_, code)
      return {'type': '%s(%d)' % (t_name, type_),
              'code': '%s(%d)' % (c_name, code)}
docs: This method is registered as ofp_error_to_jsondict(type_, code) method
      into ryu.ofproto.ofproto_v1_* modules.
      And this method returns ofp_error_msg as a json format for given
      'type' and 'code' defined in ofp_error_msg structure.
  
      Example::
  
          >>> ofproto.ofp_error_to_jsondict(4, 9)
          {'code': 'OFPBMC_BAD_PREREQ(9)', 'type': 'OFPET_BAD_MATCH(4)'}