nx_pydot
========

>>> from networkx import *
>>> from networkx.drawing import *
>>> from networkx.drawing.nx_agraph import *

>>> import os,sys

Undirected
----------

>>> H=Graph()
>>> H.add_edge('A','B')
>>> H.add_edge('A','C')
>>> H.add_edge('B','C')
>>> H.add_edge('A','D')
>>> H.add_node('E')


>>> A=to_agraph(H)
>>> N=Graph(from_agraph(A)) 
>>> sorted(N.nodes())==sorted(H.nodes())
True
>>> sorted(N.edges())==sorted(H.edges())
True

read write
----------

with file name
----------------

>>> import tempfile
>>> fname=tempfile.mktemp()
>>> write_dot(N,fname)
>>> Hin=Graph(read_dot(fname))
>>> os.unlink(fname)
>>> sorted(Hin.nodes())==sorted(H.nodes())
True
>>> sorted(Hin.edges())==sorted(H.edges())
True

with file handle
----------------

>>> (fd,fname)=tempfile.mkstemp()
>>> fh=open(fname,'w')
>>> write_dot(N,fh)
>>> fh.close()


>>> fh=open(fname,'r')
>>> Hin=Graph(read_dot(fh))
>>> sorted(Hin.nodes())==sorted(H.nodes())
True
>>> sorted(Hin.edges())==sorted(H.edges())
True
>>> fh.close()
>>> os.unlink(fname)



Directed
----------

>>> H=DiGraph()
>>> H.add_edge('A','B')
>>> H.add_edge('A','C')
>>> H.add_edge('B','C')
>>> H.add_edge('A','D')
>>> H.add_node('E')


>>> A=to_agraph(H)
>>> N=DiGraph(from_agraph(A))
>>> sorted(N.nodes())==sorted(H.nodes())
True
>>> sorted(N.edges())==sorted(H.edges())
True

>>> import tempfile
>>> fname=tempfile.mktemp()
>>> write_dot(N,fname)


>>> Hin=DiGraph(read_dot(fname))
>>> os.unlink(fname)
>>> sorted(Hin.nodes())==sorted(H.nodes())
True
>>> sorted(Hin.edges())==sorted(H.edges())
True

Layout
------

>>> pos=graphviz_layout(H,prog="circo",args="-Gepsilon=0.1")