code: def _construct_single(self, basedir, port, name=None, extra=''):
          
          datapath = self._create_paths(basedir, name)
          self._construct_mongod(os.path.join(datapath, 'db'),
                                 os.path.join(datapath, 'mongod.log'), port,
                                 replset=None, extra=extra)
  
          host = '%s:%i' % (self.args['hostname'], port)
  
          return host
docs: Construct command line strings for a single node.
  
          Handles shards and stand-alones.