code: def test_laplacian_centrality_single_node():
      """See gh-6571"""
      G = nx.empty_graph(1)
      assert nx.laplacian_centrality(G, normalized=False) == {0: 0}
      with pytest.raises(ZeroDivisionError):
          nx.laplacian_centrality(G, normalized=True)
  
file_path: networkx/networkx/algorithms/centrality/tests/test_laplacian_centrality.py
imports: import pytest
  import networkx
label_desc: Use image node_id 2 for calling a global function with example usage: test_laplacian_centrality_single_node() without return types