code: def test_laplacian_centrality_P3():
      P3 = nx.path_graph(3)
      d = nx.laplacian_centrality(P3)
      exact = {0: 0.6, 1: 1.0, 2: 0.6}
      for n, dc in d.items():
          assert exact[n] == pytest.approx(dc, abs=1e-7)
  
file_path: networkx/networkx/algorithms/centrality/tests/test_laplacian_centrality.py
imports: import pytest
  import networkx
label_desc: Use image node_id 8 for calling a global function with example usage: test_laplacian_centrality_P3() without return types