WeightedGraphQ

WeightedGraphQ[g] yields True if the graph g is a weighted graph and False otherwise.

Examples

Check if graph is weighted:

WeightedGraphQ[Graph[{1 -> 2, 2 -> 3}, EdgeWeight -> {1, 2}]]

Unweighted graph:

WeightedGraphQ[Graph[{1 -> 2, 2 -> 3}]]

Please visit the official Wolfram Language Reference for more details.