KeyError

[Ranjit]

Hi everyone,

I'm having trouble just reading in a GML graph from the sample graphs
linked to from the documentation page. I tried loading the Zachary
Karate Club graph here:

http://www-personal.umich.edu/~mejn/netdata/

like this:
G=nx.read_gml("karate.gml")

And I get the following error:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Frameworks/EPD64.framework/Versions/6.3/lib/python2.6/
site-packages/networkx/readwrite/gml.py", line 81, in read_gml
G=parse_gml(lines)
File "/Library/Frameworks/EPD64.framework/Versions/6.3/lib/python2.6/
site-packages/networkx/readwrite/gml.py", line 159, in parse_gml
label=vdict['label']
KeyError: 'label'

Any idea why this isn't working?

Thanks,

-Ranjit

[Aric Hagberg]

Maybe you have an old version of NetworkX? It works with networkx-1.4.

Python 2.6.4 (r264:75706, Dec 7 2009, 18:43:55)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import networkx as nx
>>> G=nx.read_gml('karate.gml')
>>> len(G)
34

Aric

[Ranjit]

Thanks. The problem was some combination of an old version and
something going wrong when I tried to update it. I have the Enthought
distribution installed on my computer, and it includes version 1.3 of
networkx. I tried easy_install and compiling from source at first, but
I had to delete the old package first. Now everything works.

Thanks,

-Ranjit


On Apr 18, 10:49 pm, Aric Hagberg <ahagb...@gmail.com> wrote:

[satyam mukherjee]

You can use a node relabel :

import networkx as nx

def transform_labels_to_nx(G):

    H = nx.Graph()

    label_mapping={}

        #add the nodes by label from G to H

    for node in G.nodes(data=True):

        H.add_node(node[1]['label'])

        label_mapping[node[0]] = node[1]['label']

        if len(node[1]) > 2:

            for key in node[1]:

                H.node[node[1]['label']][key] = node[1][key]

    #add the appropriate edges

    for edge in G.edges(data=True):

        H.add_edge(label_mapping[edge[0]], label_mapping[edge[1]])

        if len(edge[2]) > 0:

            for key in edge[2]:

                H[label_mapping[edge[0]]][label_mapping[edge[1]]][key] = edge[2][key]

    return H

 

--
You received this message because you are subscribed to the Google Groups "networkx-discuss" group.
To post to this group, send email to networkx...@googlegroups.com.
To unsubscribe from this group, send email to networkx-discu...@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/networkx-discuss?hl=en.

--
-------------------------------------------
WHEN LIFE GIVES U HUNDRED REASONS TO CRY,SHOW LIFE THAT U HAVE THOUSAND REASONS TO SMILE :-)

satyam mukherjee
224-436-3672 (Mob)
847-491-7238 (Off)

[Donald Ephraim Curtis]

Bump!

I am having this problem with SVN HEAD at the moment. Little
different error:

>>> import networkx as nx; nx.read_gml("karate.gml")

Traceback (most recent call last):
File "<stdin>", line 1, in <module>

File "/Users/dcurtis/Development/networkx/networkx/readwrite/
gml.py", line 85, in read_gml
G=parse_gml(lines,labels=labels)
File "/Users/dcurtis/Development/networkx/networkx/readwrite/
gml.py", line 184, in parse_gml
mapping=dict((n,d['label']) for n,d in G.node.items())
File "/Users/dcurtis/Development/networkx/networkx/readwrite/
gml.py", line 184, in <genexpr>
mapping=dict((n,d['label']) for n,d in G.node.items())
KeyError: 'label'

The problem is that the argument "labels" defaults to True. It seems
like this should be something that is detected or at least caught with
a try,except?

[Aric Hagberg]

On Mon, May 16, 2011 at 5:36 PM, Donald Ephraim Curtis
<dcu...@gmail.com> wrote:
> Bump!
>
> I am having this problem with SVN HEAD at the moment.  Little
> different error:
>

The latest NetworkX source is in the mercurial repository at
http://networkx.lanl.gov/hg/networkx

If you are using the SVN repository you have old code that might not
read the karate.gml file correctly.

Aric