NetworkX

nx_karate.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import networkx as nx
import numpy as np
import matplotlib.pyplot as plt

# Zachary's Karate Club graph
G = nx.karate_club_graph()

# to directed
G = G.to_directed()

# draw & show
nx.draw(G, pos=nx.spring_layout(G))
#plt.show()

# dumps to json
import networkx.readwrite.json_graph as jsg
s = jsg.dumps(G)
#G = jsg.loads(s)
print s

# to numpy matrix
A = nx.to_numpy_matrix(G)
np.savetxt("myfile.txt", A)
A = np.genfromtxt("myfile.txt")
print A