how to draw multigraph in networkx using matplotlib or graphviz

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Graphviz does a good job drawing parallel edges. You can use that with NetworkX by writing a dot file and then processing with Graphviz (e.g. neato layout below). You’ll need pydot or pygraphviz in addition to NetworkX

In [1]: import networkx as nx

In [2]: G=nx.MultiGraph()

In [3]: G.add_edge(1,2)

In [4]: G.add_edge(1,2)

In [5]: nx.write_dot(G,'multi.dot')

In [6]: !neato -T png multi.dot > multi.png

enter image description here

On NetworkX 1.11 and newer, nx.write_dot doesn’t work as per issue on networkx github. The workaround is to call write_dot using

from networkx.drawing.nx_pydot import write_dot

or

from networkx.drawing.nx_agraph import write_dot

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