code: def get_network_name(network_id):
          
          if os.environ.get('KEEPER_NETWORK_NAME'):
              logging.debug('keeper network name overridden by an environment variable: {}'.format(
                  os.environ.get('KEEPER_NETWORK_NAME')))
              return os.environ.get('KEEPER_NETWORK_NAME')
  
          return Keeper._network_name_map.get(network_id, Keeper.DEFAULT_NETWORK_NAME)
docs: Return the keeper network name based on the current ethereum network id.
          Return `development` for every network id that is not mapped.
  
          :param network_id: Network id, int
          :return: Network name, str