#!/usr/bin/env python

import pygraphviz as pgv
# strict (no parallel edges)
# digraph
# with attribute rankdir set to 'LR'
A=pgv.AGraph(directed=True,strict=True,rankdir='LR')
# add node 1 with color red
A.add_node(1,color='red') 
A.add_node(5,color='blue')
# add some edges
A.add_edge(1,2,color='green')
A.add_edge(2,3)
A.add_edge(1,3)
A.add_edge(3,4)
A.add_edge(3,5)
A.add_edge(3,6)
A.add_edge(4,6)
# adjust a graph parameter
A.graph_attr['epsilon']='0.001'
print A.string() # print dot file to standard output
A.layout('dot') # layout with dot
A.draw('foo.ps') # write to file