TypeError: 'NodeView' object does not support item assignment - NetworkX

Question

I'm working through this tutorial: https://www.datacamp.com/community/tutorials/networkx-python-graph-tutorial

import itertools
import copy
import networkx as nx
import pandas as pd
import matplotlib.pyplot as plt    
nodelist = pd.read_csv('https://gist.githubusercontent.com/brooksandrew/f989e10af17fb4c85b11409fea47895b/raw/a3a8da0fa5b094f1ca9d82e1642b384889ae16e8/nodelist_sleeping_giant.csv')

g = nx.Graph()

for i, nlrow in nodelist.iterrows():
    g.node[nlrow['id']] = nlrow[1:].to_dict()

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-80-35b1a259a02d> in <module>()
      1 for i, nlrow in nodelist.iterrows():
----> 2     g.node[nlrow['id']] = nlrow[1:].to_dict()

TypeError: 'NodeView' object does not support item assignment

The result from running this should look like:

[('rs_end_south', {'X': 1865, 'Y': 1598}),
 ('w_gy2', {'X': 2000, 'Y': 954}),
 ('rd_end_south_dupe', {'X': 273, 'Y': 1869}),
 ('w_gy1', {'X': 1184, 'Y': 1445}),
 ('g_rt', {'X': 908, 'Y': 1378}),
 ('v_rd', {'X': 258, 'Y': 1684}),
 ('g_rs', {'X': 1676, 'Y': 775}),
 ('rc_end_north', {'X': 867, 'Y': 618}),
 ('v_end_east', {'X': 2131, 'Y': 921}),
 ('rh_end_south', {'X': 721, 'Y': 1925})]

But I can't get python to output the id followed by the dict.

Which python version are you using? Could be an Python2 vs Python3 issue — Murmel
– Murmel, Commented Oct 31, 2017 at 22:33
You could use g.node[nlrow['id']].update(nlrow[1:].to_dict()) instead of g.node[nlrow['id']] = nlrow[1:].to_dict() — Murmel
– Murmel, Commented Oct 31, 2017 at 23:29
Note - you're using networkx version 2.0, right? It's very recent, and so I suspect that this is an incompatibility from the person writing it using version 1.11. I think networkx provides ways to do what these commands are trying to do without directly editing the underlying data structure of the graph. — Joel
– Joel, Commented Nov 1, 2017 at 2:23

Murmel · Accepted Answer · 2020-05-18 11:18:05Z

Instead of:

g.node[nlrow['id']] = nlrow[1:].to_dict()

use:

g.nodes[nlrow['id']].update(nlrow[1:].to_dict())

This works because g.nodes[x] is nothing else than a dict. Nevertheless, I'm not sure why the documentation proposes the other way.

Note:

Joel made a good point in the comments, which I think is very important:

Note - you're using networkx version 2.0, right? It's very recent, and so I suspect that this is an incompatibility from the person writing it using version 1.11. I think networkx provides ways to do what these commands are trying to do without directly editing the underlying data structure of the graph.

So my solution basically works by having knowledge about the underlying data structure and not using the public api, which is not good programming style.

Since Version 2.4, G.node is deprecated in favor of G.nodes (Thank you, WiccanKarnak).

You might want to consider changing g.node to g.nodes as indicated here stackoverflow.com/a/58598016/6946802

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