Re: [igraph] trouble with attaching attributes in python igraph

[Tamas Nepusz]

Hi Eytan,

Thanks for reporting that, I just committed a fix, see:
http://cneurocvs.rmki.kfki.hu/cgi-bin/archzoom.cgi/address@hidden/igraph--main--0.5--patch-524?log

--  
Tamas

On 2008.07.09., at 3:23, Eytan Bakshy wrote:

> Hello,
>
> I have been using the attribute functionality of python igraph and  
> ran into a few issues when attaching vertex and edge attributes:
>
> If you do not specify n ahead of time, it seems like edge attributes  
> and vertex attributes do not get set.
>
> For example if I do:
>   g = Graph([(0,1),(1,0)],edge_attrs={'a':[1,2]})
> g.es.attribute_names() is empty,
>
> but if I do:
>   g = Graph(2, [(0,1),(1,0)],edge_attrs={'a':[1,2]})
> g.es.attribute_names() has 'a'.
>
> The same seems to hold true for vertex_attrs as well.  I have a  
> feeling that this has to do with shifting the parameters in  
> Graph.__init__(), but I don't understand exactly how optional  
> arguments work in python...
>
>
> Also, if you pass a tuple instead of a list as a key of an  
> attribute, python crashes with a Bus Error:
>   g = Graph(2,[(0,1),(1,0)],edge_attrs={'a':(1,2)})
>
>
> Thanks,
>
> -eytan
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