the FreeCAD python macro/script creates 3 boxes and then fuses two

FreeCAD_macro_test1_20170412.py

test1 = App.newDocument("Test1")

cylinder=test1.addObject("Part::Box","Cylinder")
cylinder.Height = '20 mm'
cylinder.Width = '5 mm'
cylinder.Length = '40 mm'

myvec = App.Vector(5,0,5)
myvec_2 = App.Vector(0,0,0)

mybox=test1.addObject("Part::Box","Mybox")
mybox.Height = '5 mm'
mybox.Width = '15 mm'
mybox.Length = '10 mm'


mybox.Placement.Base = myvec

mybox_2=test1.addObject("Part::Box","Mybox_2")
mybox_2.Height = '5 mm'
mybox_2.Width = '10 mm'
mybox_2.Length = '20 mm'

mybox_2.Placement.Base = myvec_2

myfus = test1.addObject("Part::Fuse","myFus")
myfus.Base = mybox
myfus.Tool = mybox_2
mybox.Visibility=False
mybox_2.Visibility=False