bmesh_testing.py

import bpy
import bmesh

obj = bpy.context.active_object
me = obj.data
bm = bmesh.from_edit_mesh(me)
me.update()

edges = bm.edges
ok = lambda v: v.select and not v.hide
idxs = [v.index for v in edges if ok(v)]

ei = [bm.edges[i].verts for i in idxs]
ii = ei[0][0].index, ei[0][1].index, ei[1][0].index, ei[1][1].index

print(ii)

# polygon indices? must be nicer ways.
[[i.index for i in p] for p in [p.verts for p in bm.faces]]
[[i.index for i in p.verts] for p in bm.faces[:]]