Amount is offset of new edges from original.
import bpyscene=bpy.context.scenescene.objects.active = bpy.data.objects["Cube"]bpy.ops.object.mode_set(mode="EDIT")bpy.ops.mesh.bevel(offset_type='OFFSET', offset=0.123, segments=1, profile=0.5, vertex_only=False)bpy.ops.object.mode_set(mode="OBJECT")
bpy.ops.mesh.bevel(offset_type='OFFSET', offset=0.123, segments=1, profile=0.5, vertex_only=False)