Comment 6 for bug 1718576

It looks like taskflow is the real issue here. It is relying on the nodes_iter method that was removed in networkx 2.0. See https://networkx.github.io/documentation/stable/release/release_2.0.html?highlight=nodes_iter for how to do that with networkx 2.0.

There may be other issues that also need to be addressed. See https://networkx.github.io/documentation/stable/release/migration_guide_from_1.x_to_2.0.html