What could cause NetworkX & PyGraphViz to work fine alone but not together?

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There is a small bug in the draw_graphviz function in networkx-1.11 triggered by the change that the graphviz drawing tools are no longer imported into the top level namespace of networkx.

The following is a workaround

In [1]: import networkx as nx

In [2]: G = nx.complete_graph(5)

In [3]: from networkx.drawing.nx_agraph import graphviz_layout

In [4]: pos = graphviz_layout(G)

In [5]: nx.draw(G, pos)

To use the other functions such as to_agraph, write_dot, etc you will need to explicitly use the longer path name

 nx.drawing.nx_agraph.write_dot()

or import the function into the top-level namespace

from networkx.drawing.nx_agraph import write_dot()
write_dot()

These command use graphviz to calculate the positioning of the nodes (graphviz_layout uses neato per default), and matplotlib to actually plot (i.e. draw) the graph.

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