[graph-tool] Create an edge property map for weights

I am passing in a graphml file that has the weights of the edges. How do I create an edge_property_map to either: -pass in the sum of the weights (using different python code) of the graph to the degre_property_map? or -use the edge_property_map to apply the weights that are in the file? (Can the egde_property_map gather this information) -- Sent from: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/