code: def test_creation_sequences(self):
      deg = [3, 2, 2, 1]
      G = nx.generators.havel_hakimi_graph(deg)
  
      with pytest.raises(ValueError):
          nxt.creation_sequence(deg, with_labels=True, compact=True)
  
      cs0 = nxt.creation_sequence(deg)
      H0 = nxt.threshold_graph(cs0)
      assert "".join(cs0) == "ddid"
  
      cs1 = nxt.creation_sequence(deg, with_labels=True)
      H1 = nxt.threshold_graph(cs1)
      assert cs1 == [(1, "d"), (2, "d"), (3, "i"), (0, "d")]
  
      cs2 = nxt.creation_sequence(deg, compact=True)
      H2 = nxt.threshold_graph(cs2)
      assert cs2 == [2, 1, 1]
      assert "".join(nxt.uncompact(cs2)) == "ddid"
      assert graph_could_be_isomorphic(H0, G)
      assert graph_could_be_isomorphic(H0, H1)
      assert graph_could_be_isomorphic(H0, H2)
  
imports: import pytest
  import networkx
  import networkx.algorithms.threshold
  from networkx.algorithms.isomorphism.isomorph import graph_could_be_isomorphic
label_desc: Use image node_id 2 for calling the TestGeneratorThreshold obj's underlying member method code with example usage: obj.test_creation_sequences() without return types