Heavy Metal Umlaut¶

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Example using unicode strings as graph labels.

Also shows creative use of the Heavy Metal Umlaut:
http://en.wikipedia.org/wiki/Heavy_metal_umlaut

"""
__author__ = """Aric Hagberg (hagberg@lanl.gov)"""
__date__ = ""
__credits__ = """"""
__revision__ = ""
#    Copyright (C) 2006 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
try:
    import pylab as P
except ImportError:
    pass

try:
    hd='H' + unichr(252) + 'sker D' + unichr(252)
    mh='Mot' + unichr(246) + 'rhead'
    mc='M' + unichr(246) + 'tley Cr' + unichr(252) + 'e'
    st='Sp' + unichr(305) + 'n' + unichr(776) + 'al Tap'
    q='Queensr' + unichr(255) + 'che'
    boc='Blue ' + unichr(214) +'yster Cult'
    dt='Deatht' + unichr(246) + 'ngue'
except NameError:
    hd='H' + chr(252) + 'sker D' + chr(252)
    mh='Mot' + chr(246) + 'rhead'
    mc='M' + chr(246) + 'tley Cr' + chr(252) + 'e'
    st='Sp' + chr(305) + 'n' + chr(776) + 'al Tap'
    q='Queensr' + chr(255) + 'che'
    boc='Blue ' + chr(214) +'yster Cult'
    dt='Deatht' + chr(246) + 'ngue'

G=NX.Graph()
G.add_edge(hd,mh)
G.add_edge(mc,st)
G.add_edge(boc,mc)
G.add_edge(boc,dt)
G.add_edge(st,dt)
G.add_edge(q,st)
G.add_edge(dt,mh)
G.add_edge(st,mh)

# write in UTF-8 encoding
fh=open('edgelist.utf-8','wb')
fh.write('# -*- coding: utf-8 -*-\n'.encode('utf-8')) # encoding hint for emacs
NX.write_multiline_adjlist(G,fh,delimiter='\t', encoding = 'utf-8')

# read and store in UTF-8
fh=open('edgelist.utf-8','rb')
H=NX.read_multiline_adjlist(fh,delimiter='\t', encoding = 'utf-8')

for n in G.nodes():
    if n not in H:
        print(False)

print(G.nodes())

try:
    pos=NX.spring_layout(G)
    NX.draw(G,pos,font_size=16,with_labels=False)
    for p in pos: # raise text positions
        pos[p][1]+=0.07
    NX.draw_networkx_labels(G,pos)
    P.show()
except:
    pass