set_edge_attributes

set_edge_attributes(G, name, values)

Sets edge attributes from a given value or dictionary of values.

Parameters:

• G (NetworkX Graph)

• name (string) – Name of the edge attribute to set.

• values (dict) – Dictionary of attribute values keyed by edge (tuple). For multigraphs, the tuples must be of the form (u, v, key), where u and v are nodes and key is the key corresponding to the edge. For non-multigraphs, the keys must be tuples of the form (u, v).

  If values is not a dictionary, then it is treated as a single attribute value that is then applied to every edge in G. This means that if you provide a mutable object, like a list, updates to that object will be reflected in the edge attribute for each edge.

Examples

After computing some property of the nodes of a graph, you may want to assign a node attribute to store the value of that property for each node:

>>> G = nx.path_graph(3)
>>> bb = nx.edge_betweenness_centrality(G, normalized=False)
>>> nx.set_edge_attributes(G, 'betweenness', bb)
>>> G.edge[1][2]['betweenness']
2.0

If you provide a list as the third argument, updates to the list will be reflected in the edge attribute for each node:

>>> labels = []
>>> nx.set_edge_attributes(G, 'labels', labels)
>>> labels.append('foo')
>>> G.edge[0][1]['labels']
['foo']
>>> G.edge[1][2]['labels']
['foo']