n-ary tree widget

[Padraig at Linux.ie]

student wrote:
> Hi,  I have an application where i have a tree like structure that i
> would like to be able to interact with.  Is there a tree widget with
> collapsable/expandable branches.  For my particular application nodes
> can have references to other nodes in the tree... for example
> 
>                                *
>                               /|
>                              / |
>                             /  |
>                          -------------
>                          | / |   |   |
>                          |/  |   |   | 
>                          *   *   *   *
> 
> notice the first node in the 2nd row points to the root.

yep that's a graph not a tree.

I never actually visualised a graph in python yet,
but was considering it for a project:

otter http://www.caida.org/tools/visualization/otter/paper/
graphviz http://www.research.att.com/sw/tools/graphviz/ 
http://www.cs.brown.edu/~er/software/
chiclid (3d) http://moat.nlanr.net/Software/Cichlid/
http://graphdrawing.org/
http://www.aisee.com/ (? http://www.aisee.com/apps/fxviz.htm This is 
free and mentions it uses vcg?)
http://www.tulip-software.org/

Pádraig.