Hello,

I am new to the tool, which looks amazing so far!

I have a question: all graphs are created as multigraphs. I would like to load 
graphs with signed edges, and be able to remove some of them for different 
tests. Yet, after removal, I’d like to simplify the graph and collapse all 
multiple edges between the same two nodes into a unique edge, summing up all 
the weights of these different edges into a unique weight.
How would you suggest doing it? Besides externally from graph_tool, that is.

Thanks!

Giovanni

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