_edge_value(G, edge_attr)
Suppose there exists an edge between u and v. Then we return a function expecting u and v as arguments. For Graph and DiGraph, G[u][v] is the edge attribute dictionary, and the function (essentially) returns G[u][v][edge_attr]. However, we also handle cases when :None:None:`edge_attr` is None and when it is a function itself. For MultiGraph and MultiDiGraph, G[u][v] is a dictionary of all edges between u and v. In this case, the returned function sums the value of :None:None:`edge_attr` for every edge between u and v.
A NetworkX graph
Specification of how the value of the edge attribute should be obtained from the edge attribute dictionary, G[u][v]. For multigraphs, G[u][v] is a dictionary of all the edges between u and v. This allows for special treatment of multiedges.
A function expecting two nodes as parameters. The nodes should represent the from- and to- node of an edge. The function will return a value from G[u][v] that depends on :None:None:`edge_attr`.
Returns a function that returns a value from G[u][v].
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