This documents an unmaintained version of NetworkX. Please upgrade to a maintained version and see the current NetworkX documentation.


write_weighted_edgelist(G, path, comments='#', delimiter=' ', encoding='utf-8')[source]

Write graph G as a list of edges with numeric weights.

  • G (graph) – A NetworkX graph
  • path (file or string) – File or filename to write. If a file is provided, it must be opened in ‘wb’ mode. Filenames ending in .gz or .bz2 will be compressed.
  • comments (string, optional) – The character used to indicate the start of a comment
  • delimiter (string, optional) – The string used to separate values. The default is whitespace.
  • encoding (string, optional) – Specify which encoding to use when writing file.


>>> G=nx.Graph()
>>> G.add_edge(1,2,weight=7)
>>> nx.write_weighted_edgelist(G, 'test.weighted.edgelist')