code: def test_subgraph_nbunch(self):
      nullgraph = nx.null_graph()
      K1 = nx.complete_graph(1)
      K3 = nx.complete_graph(3)
      K5 = nx.complete_graph(5)
      # Test G.subgraph(nbunch), where nbunch is a single node
      H = K5.subgraph(1)
      assert nx.is_isomorphic(H, K1)
      # Test G.subgraph(nbunch), where nbunch is a set
      H = K5.subgraph({1})
      assert nx.is_isomorphic(H, K1)
      # Test G.subgraph(nbunch), where nbunch is an iterator
      H = K5.subgraph(iter(K3))
      assert nx.is_isomorphic(H, K3)
      # Test G.subgraph(nbunch), where nbunch is another graph
      H = K5.subgraph(K3)
      assert nx.is_isomorphic(H, K3)
      H = K5.subgraph([9])
      assert nx.is_isomorphic(H, nullgraph)
  
imports: import pytest
  import networkx
  from networkx import convert_node_labels_to_integers
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 34 for calling the HistoricalTests obj's underlying member method code with example usage: obj.test_subgraph_nbunch() without return types