CODEWITHSUNDEEP
pythondictionarynetworkx
AKKA
AKKA

Reputation: 165

NetworkX not showing the data attributes of nodes

I am having this weird behavior with NetworkX that is not following what would be expected based on the documentation on the Graph object.

Here is my code:

In [22]: G = nx.Graph()

In [23]: G.add_node("Roasted",attr_dict={"css_color":"#454463"})

In [24]: G["Roasted"]
Out[24]: {}

In [25]: G.nodes(data=True)
Out[25]: [('Roasted', {'css_color': '#454463'})]

At In [23] I added a node with an attribute dictionary. In In [24], I was simply indexing the graph G like I would on a dictionary and expected it to return {'css_color':'#454463'}but I got back an empty dictionary instead. I only get to see that dictionary if I were to call for a printout of the list of nodes with their data displayed.

In the documentation, it showed that:

>>> G.add_node(1, time='5pm')
>>> G.add_nodes_from([3], time='2pm')
>>> G.node[1]
{'time': '5pm'}

you should be able to obtain the dictionary simply by indexing on the node name itself. Why did it not work for my case?

EDIT: In case the problem could have been that I used a string instead of an int for the node name, I tried this:

In [29]: G.add_node(1,attr_dict={"css_color":"#454463"})

In [30]: G[1]
Out[30]: {}

And the problem still persists! Could this be a bug???

Upvotes: 0

Views: 1286

Answers (1)

Joel
Joel

Reputation: 23887

Your expectation that G["Roasted"] should give the attributes of the node "Roasted" is the source of the error. In fact G["Roasted"] gives information about the neighbors of "Roasted". The fact that it is an empty dictionary represents the fact that you have not assigned any neighbors to "Roasted".

import networkx as nx
G=nx.Graph()
G.add_edge(1,2)
G[1]
>{2: {}}

What you need to use is G.node["Roasted"] rather than G["Roasted"].

Upvotes: 1

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