import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-7))
r=w0.sketch().segment((-45,-4),(-36,-5)).segment((-36,-50)).segment((36,-50)).segment((36,-7)).segment((45,-7)).segment((45,4)).segment((36,5)).segment((36,50)).segment((-36,50)).segment((-36,7)).segment((-45,7)).close().assemble().rect(34,6,mode='s').finalize().extrude(14)