Duplicate edges in .gml file using networkx.read_gml python

I want to use networkx in python to read a .gml file.

However when I do,

import networkx as nx
nx.read_gml("myfilename.gml")

it raises the error

networkx.exception.NetworkXError: edge #213 (103->400) is duplicated 

which is true that in the .gml file there are duplicate edges.

Is there any way to read a .gml file with duplicate edges without raising an error?

Answer

You should simply add “multigraph 1” to the file header, which allows the graph to have multiple edges and will result in nx.read_gml returning a MultiDiGraph.

Already, the full error trace should already give you this answer

Hint: If multigraph add "multigraph 1" to file header.

taken from parse_gml_lines, if you are using the latest networkx version.