This documents the development version of NetworkX. Documentation for the current release can be found here.


write_gexf(G, path, encoding='utf-8', prettyprint=True, version='1.2draft')[source]

Write G in GEXF format to path.

“GEXF (Graph Exchange XML Format) is a language for describing complex networks structures, their associated data and dynamics” 1.

Node attributes are checked according to the version of the GEXF schemas used for parameters which are not user defined, e.g. visualization ‘viz’ 2. See example for usage.

  • G (graph) – A NetworkX graph

  • path (file or string) – File or file name to write. File names ending in .gz or .bz2 will be compressed.

  • encoding (string (optional, default: ‘utf-8’)) – Encoding for text data.

  • prettyprint (bool (optional, default: True)) – If True use line breaks and indenting in output XML.


>>> G = nx.path_graph(4)
>>> nx.write_gexf(G, "test.gexf")

# visualization data >>> G.nodes[0][“viz”] = {“size”: 54} >>> G.nodes[0][“viz”][“position”] = {“x”: 0, “y”: 1} >>> G.nodes[0][“viz”][“color”] = {“r”: 0, “g”: 0, “b”: 256}


This implementation does not support mixed graphs (directed and undirected edges together).

The node id attribute is set to be the string of the node label. If you want to specify an id use set it as node data, e.g. node[‘a’][‘id’]=1 to set the id of node ‘a’ to 1.



GEXF File Format,


GEXF viz schema 1.1,