Create Plane by other plane

 1from salome.shaper import model
 2
 3model.begin()
 4partSet = model.moduleDocument()
 5Part_1 = model.addPart(partSet)
 6Part_1_doc = Part_1.document()
 7Box_1 = model.addBox(Part_1_doc, 10, 10, 10)
 8Plane_4 = model.addPlane(Part_1_doc, model.selection("FACE", "Box_1_1/Top"), 10, False)
 9model.do()
10model.end()

Download this script