bmesh_from_pydata, pydata_from_bmesh

bmesh_utils.py

import bmesh


def bmesh_from_pydata(verts, edges=None, faces=None):
    ''' verts is necessary, edges/faces are optional '''

    bm = bmesh.new()
    add_vert = bm.verts.new

    bm_verts = [add_vert(co) for co in verts]
    bm.verts.index_update()

    if faces:
        add_face = bm.faces.new
        for face in faces:
            add_face([bm_verts[i] for i in face])
        bm.faces.index_update()

    if edges:
        add_edge = bm.edges.new
        for edge in edges:
            edge_seq = bm_verts[edge[0]], bm_verts[edge[1]]
            try:
                add_edge(edge_seq)
            except ValueError:
                # edge exists!
                pass
        bm.edges.index_update()

    return bm


def pydata_from_bmesh(bm):
    v = [v.co[:] for v in bm.verts]
    e = [[i.index for i in e.verts] for e in bm.edges[:]]
    p = [[i.index for i in p.verts] for p in bm.faces[:]]
    return v, e, p