best way to select edge to use bmesh.ops.bevel I would like to bevel some of the edges of my object.
I tried this code (works but is not consistent)

bm.edges.ensure_lookup_table()
ebd = [
        {'idx': 20, 'profile': 0.5, 'offset': 0.005, 'segments': 10},
    ]

# first get the edges
for i in range(len(ebd)):
    ebd[i]['edge'] = bm.edges[ebd[i]['idx']]

# bevel each edge
for i in range(len(ebd)):
    e = ebd[i]['edge']
    bev_geom = [e.verts[0], e.verts[1], e]
    p = ebd[i]['profile']
    o = ebd[i]['offset']
    s = ebd[i]['segments']
bmesh.ops.bevel(bm, geom=bev_geom, offset=o, segments=s, profile=p)


I noticed that the index number of the edges changes. So every time I run this code another edge is bevelled. maybe I do something wrong idk.
What I did noticed is that the vertex number is the same every time I insert the object. So I was wondering and could not find any on the forum so far that shows me how to select an edge based on 2 vertices. Or how I can select the edges I want and then bevel them so that every time I insert the object the correct edges are bevelled. 

Another code I tried is

    indices1 = [3, 15]
    vertices = [e for e in bm.verts]
    v_edges = []
    for vert in vertices:
        if vert.index in indices1:
            vert.select = True
            v_edges = v_edges + [vert]         
        else:
            vert.select = False

bmesh.ops.bevel(bm, 
                #bev_geom=v_edges,
                geom = v_edges,
                offset=0.005, 
                segments=10, 
                profile=0.5
                )


This will obviously select 2 vertices. 
Can i use these 2 vertices to select the edge between them?

Regards
I tried thes Lines: 

import bmesh
from bpy import context as C

m = C.active_object.data
bm = bmesh.from_edit_mesh(m)

indices = [0,1]
for e in bm.edges:
    if e.verts[0].index in indices and e.verts[1].index in indices:
        e.select = True
        break


The selection doesn't show up in edge select mode, but if you go to vert select, and back to edge, the edge will be correctly displayed as selected. 
How to continue from there with the operator, I have not tested.