Add an edge in the document:
ed = doc.addEdge(vx_1, vx_2)
Set of index: 0 1.
Get the number of edges in the document:
ne = doc.countEdge()
Get an edge of the document:
edg = doc.getEdge(i)
Get the vertices of an edge:
ver_a = ed.getVertex(0)
ver_b = ed.getVertex(1)
Find an edge in the document:
edg = doc.findEdge(ver1, ver2)
GUI command: Edge