#!/usr/bin/env python
"""
=====================
Pygraphviz Attributes
=====================

An example showing how to use the interface to the pygraphviz
AGraph class to convert to and from graphviz.

Also see the pygraphviz documentation and examples at
http://pygraphviz.github.io/
"""
# Author: Aric Hagberg (hagberg@lanl.gov)

#    Copyright (C) 2006-2019 by
#    Aric Hagberg <hagberg@lanl.gov>
#    Dan Schult <dschult@colgate.edu>
#    Pieter Swart <swart@lanl.gov>
#    All rights reserved.
#    BSD license.

import networkx as nx

# networkx graph
G = nx.Graph()
# ad edges with red color
G.add_edge(1, 2, color='red')
G.add_edge(2, 3, color='red')
# add nodes 3 and 4
G.add_node(3)
G.add_node(4)

# convert to a graphviz agraph
A = nx.nx_agraph.to_agraph(G)

# write to dot file
A.write('k5_attributes.dot')

# convert back to networkx Graph with attributes on edges and
# default attributes as dictionary data
X = nx.nx_agraph.from_agraph(A)
print("edges")
print(list(X.edges(data=True)))
print("default graph attributes")
print(X.graph)
print("node node attributes")
print(X.nodes.data(True))