EdgeListIterator

#!/usr/bin/env python3

# noinspection PyUnresolvedReferences
import vtkmodules.vtkInteractionStyle
# noinspection PyUnresolvedReferences
import vtkmodules.vtkRenderingOpenGL2
from vtkmodules.vtkCommonDataModel import (
    vtkEdgeListIterator, vtkMutableUndirectedGraph
)


def main():
    g = vtkMutableUndirectedGraph()

    # Create a graph
    v0 = g.AddVertex()
    v1 = g.AddVertex()
    v2 = g.AddVertex()

    g.AddEdge(v0, v1)
    g.AddEdge(v1, v2)
    g.AddEdge(v0, v2)

    edge_list_iterator = vtkEdgeListIterator()
    g.GetEdges(edge_list_iterator)

    while edge_list_iterator.HasNext():
        # For Python use  'NextGraphEdge()' instead of 'Next()'.
        edge = edge_list_iterator.NextGraphEdge()
        print(f'Edge: {edge.id} is from Source: {edge.source} to Target: {edge.target}')


if __name__ == '__main__':
    main()