poly face

[h3d-hieuct]

import ezdxf
doc = ezdxf.new("R2010")
msp = doc.modelspace()
polyface = msp.add_polyface()
polyface.append_face([(0,0),(0,2),(1,2),(1,1),(2,1),(2,0),(0,0)])
doc.saveas("polyface.dxf")

face has 4 points ??
how to get 6 points ?
Thanks