Method to save networkx graph to json graph?

Question

Seems like there should be a method in networkx to export the json graph format, but I don't see it. I imagine this should be easy to do with nx.to_dict_of_dicts(), but would require a bit of manipulation. Anyone know of a simple and elegant solution?

Answer 1

This documentation contains a full description

A simple example is this:

import networkx as nx from networkx.readwrite import json_graph  DG = nx.DiGraph() DG.add_edge('a', 'b') print json_graph.dumps(DG) 

You can also take a look at the Javascript/SVG/D3 nice example on adding physics to the graph visualization.

Answer 2

Here is a JSON approach that I just did, together with code to read the results back in. It saves the node and edge attributes, in case you need that.

import simplejson as json import networkx as nx G = nx.DiGraph() # add nodes, edges, etc to G ...  def save(G, fname):     json.dump(dict(nodes=[[n, G.node[n]] for n in G.nodes()],                    edges=[[u, v, G.edge[u][v]] for u,v in G.edges()]),               open(fname, 'w'), indent=2)  def load(fname):     G = nx.DiGraph()     d = json.load(open(fname))     G.add_nodes_from(d['nodes'])     G.add_edges_from(d['edges'])     return G