code: def higher_neighbors(self):
      return [x.higher_node for x in self.lower_edges]
  
file_path: sqlalchemy/examples/graphs/directed_graph.py
imports: from sqlalchemy import Column
  from sqlalchemy import create_engine
  from sqlalchemy import ForeignKey
  from sqlalchemy import Integer
  from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy.orm import relationship
  from sqlalchemy.orm import sessionmaker
label_desc: Use image node_id 1 for calling the Node obj's underlying member method code with example usage: obj.higher_neighbors() and returns: unknown