How set light or toside attribute

Coding Python Support
1

I have many objects. How I can with python change the attribute light or toside for this objects

2

there are attributes of an NMFace that are not shown in dir(NMFaceObj)
one is flags
the other is transp
flags contains the collision, light, twoside … stuff (they are or-ed together)
transp contains the drawmode (add, opaque, alpha)

I think there is a subtract constant, but it has no effect

the constants are in Blender.NMesh.Const and I shall just copy some of the documentation here:
Blender.NMesh.Const.ACTIVE
Blender.NMesh.Const.ADD
Blender.NMesh.Const.ALL
Blender.NMesh.Const.ALPHA
Blender.NMesh.Const.BILLBOARD
Blender.NMesh.Const.DYNAMIC
Blender.NMesh.Const.HALO
Blender.NMesh.Const.HIDE
Blender.NMesh.Const.INVISIBLE
Blender.NMesh.Const.LIGHT
Blender.NMesh.Const.OBCOL
Blender.NMesh.Const.SELECT
Blender.NMesh.Const.SHADOW
Blender.NMesh.Const.SHAREDCOL
Blender.NMesh.Const.SHAREDVERT
Blender.NMesh.Const.SOLID
Blender.NMesh.Const.SUB
Blender.NMesh.Const.TEX
Blender.NMesh.Const.TILES
Blender.NMesh.Const.TWOSIDE