code: def filter_oids(self, oids):
          '''
          Leaves only objects with specified oids.
  
          :param oids: list of oids to include
          '''
          oids = set(oids)
          return self[self['_oid'].map(lambda x: x in oids)f filter_oids(self, oids):
          '''
          Leaves only objects with specified oids.
  
          :param oids: list of oids to include
          '''
          oids = set(oids)
          return self[self['_oid'].map(lambda x: x in oids)]
docs: Leaves only objects with specified oids.
  
          :param oids: list of oids to include