Re: [igraph] Python bindings issue

[Filip Hermans]

Dear Tamas,

Thanks for you quick respons. It was very helpfull to me and pointed  
out that i got the vertex_attrs dictionary concept wrong. However, it  
seems like the constructor of the Graph class doesn't support the  
keyword vertex_attrs. What does the job is something like this

>>> g = Graph(n=2, edges=[(0,1),(0,2)], directed=True)
>>> g.vs["node"] = nodes

The following code still gives the same error
>>> vattrs = {"node": nodes}
>>> g = Graph(n=2, edges=[(0,1),(0,2)], directed=True,  
vertex_attrs=vattrs)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'vertex_attrs' is an invalid keyword argument for this  
function

Because of your comments i got a way to make things work, but there is  
a problem with the direct initialization of the Graph.vs dictionary  
via the constructor. Maybe this is a problem with my configuration (i  
am working on a Mac), but i reinstalled igraph and the error stays.

Again, a lot of thanks,

Filip


Op 3-jun-08, om 22:29 heeft Tamas Nepusz het volgende geschreven:

> Dear Filip,
>
> > # create the vertex_attrs dictionary
> > vattrs = {0:nodes[0],1:nodes[1],2:nodes[2]}
> The vertex_attrs dictionary should map attribute names to the list  
> of attribute values. If  you use the dictionary above, igraph does  
> not know the attribute name to which it should map the nodes[]  
> array. A better solution is this:
>
> >>> vattrs = {"node": nodes}
>
> This maps the "nodes" list (or more precisely a shallow copy of  
> that) to an attribute called "node":
>
> >>> g = Graph(n=2, edges=[(0,1),(0,2)], directed=True,  
> vertex_attrs=vattrs)
> >>> print g.vs["node"]
> [<__main__.Node instance at 0x192a3a0>, <__main__.Node instance at  
> 0x192a300>, <__main__.Node instance at 0x192a378>]
>
> --
> Tamas
>
>
>
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