code: def get_adjacent_pathways(self, pathway):
          
          vertex_id = self.pathways[pathway]
          adjacent = self.vertices[vertex_id].get_adjacent_vertex_ids()
          adjacent_pathways = []
          for adjacent_id in adjacent:
              adjacent_pathways.append(self.get_pathway_from_vertex_id(
                  adjacent_id))
          return adjacent_pathways
docs: Get the pathways adjacent to this pathway in the network
  
          Parameters
          -----------
          pathway : str
  
          Returns
          -----------
          list(str), a list of pathways adjacent to the input pathway