Storing and Accessing node attributes python networkx

Question

I have a network of nodes created using python networkx. i want to store information in nodes such that i can access the information later based on the node lab

Answer 1

Additionally, you don't have to just assign the attributes when the node is added. Even after it's been added you can still set them directly.

import networkx as nx
G=nx.Graph()
G.add_edge(1,2)
#see comment below code for recent versions of networkx.
G.node[1]['name'] = 'alpha'
G.node[2]['name'] = 'omega'

G.node[1]['name']
> 'alpha'

Note: In version 2.4+, use G.nodes[] instead of G.node[]. See deprecation notes.

You can also use set_node_attributes (documentation) which will let you set an attribute for multiple nodes at the same time:

edit

#use the next line if it's networkx version 1.x
#nx.set_node_attributes(G, 'cost', {1:3.5, 2:56})

#use the next line if it's networkx version 2.x
#nx.set_node_attributes(G, {1:3.5, 2:56}, 'cost')

#or for something that works for 1.x or 2.x
nx.set_node_attributes(G, values = {1:3.5, 2:56}, name='cost')

G.node[1]['cost']
> 3.5

Similar approaches can be used to set edge attributes.