import Blender
from Blender import NMesh 
me = NMesh.GetRaw()
v=NMesh.Vert(1.0,0.0,0.0)
me.verts.append(v)
v=NMesh.Vert(1.0,1.0,0.0)
me.verts.append(v)
v=NMesh.Vert(0.0,1.0,0.0)
me.verts.append(v)
v=NMesh.Vert(0.0,0.0,0.0)
me.verts.append(v)
f=NMesh.Face()
f.v.append(me.verts[0 ])
f.v.append(me.verts[1 ])
f.v.append(me.verts[2 ])
f.v.append(me.verts[3 ])
me.faces.append(f)
NMesh.PutRaw(me, " plane", 1)
Blender.Redraw()