[Bf-python] Bmesh don't refresh the mesh in edit mode?

[ValterVB]

Try this in Edit mode:

import bpy, bmesh
obj = bpy.context.object
mesh = obj.data
bm = bmesh.from_mesh(mesh)

bm.verts[0].co.x +=  1

To see the modified mesh I must to go to in Object mode.
if I want a "real time" update of the mesh what I must doing?

Thanks
Valter