code: def test_comments_None():
      edgelist = ["node#1 node#2", "node#2 node#3"]
      # comments=None supported to ignore all comment characters
      G = nx.parse_edgelist(edgelist, comments=None)
      H = nx.Graph([e.split(" ") for e in edgelist])
      assert edges_equal(G.edges, H.edges)
  
imports: import io
  import textwrap
  import pytest
  import networkx
  from networkx.utils import edges_equal, graphs_equal, nodes_equal
label_desc: Use image node_id 9 for calling a global function with example usage: test_comments_None() without return types