def graphviz_layout(G, prog='neato', root=None, args=''):
 return pygraphviz_layout(G, prog=prog, root=root, args=args)

def graphviz_layout ( G , prog = 'neato' , root = None , args = '' ) : return pygraphviz_layout ( G , prog = prog , root = root , args = args )
create node positions for g using graphviz .