edge to curve blender addon

.py

import bpy
from bpy.types import Mesh, Curve
import bmesh

"""辺をカーブにしてベベルを付ける"""
def edgea(ops):
    objs = bpy.context.selected_objects
    bpy.ops.object.select_all(action='DESELECT')
    for obj in objs:
        bpy.data.objects[obj.name].select = True
        bpy.context.scene.objects.active = obj

        bpy.ops.object.mode_set(mode='EDIT')
        me = obj.data
        if type(me) is Mesh:
            bm = bmesh.from_edit_mesh(me)
            a = len(bm.faces)

            bpy.ops.mesh.select_all(action='SELECT')
            bpy.ops.mesh.remove_doubles()

            bmesh.update_edit_mesh(me)
            bpy.ops.object.mode_set(mode='OBJECT')

            if not a:
                bpy.ops.object.convert(target='CURVE')
                if type(bpy.context.object.data) is Curve and ops.bevel:
                    bpy.context.object.data.bevel_object = bpy.data.objects[ops.bevel]
        else:
            bpy.ops.object.mode_set(mode='OBJECT')
        bpy.data.objects[obj.name].select = False

    return True