An interface for creating both directed and non directed graphs from
Python. Currently all attributes implemented in the Dot language are
supported (up to Graphviz 1.16). Output can be inlined in Postscript
into interactive scientific environments like TeXmacs, or output in any
of the formats supported by the Graphviz tools dot, neato, twopi.

WWW: http://code.google.com/p/pydot/