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


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

Write graph G in single-line adjacency-list format to path.

  • G (NetworkX graph)
  • path (string or file) – Filename or file handle for data output. Filenames ending in .gz or .bz2 will be compressed.
  • comments (string, optional) – Marker for comment lines
  • delimiter (string, optional) – Separator for node labels
  • encoding (string, optional) – Text encoding.


>>> G=nx.path_graph(4)
>>> nx.write_adjlist(G,"test.adjlist")

The path can be a filehandle or a string with the name of the file. If a filehandle is provided, it has to be opened in ‘wb’ mode.

>>> fh=open("test.adjlist",'wb')
>>> nx.write_adjlist(G, fh)


This format does not store graph, node, or edge data.