import cadquery as cq
w0=cq.Workplane('YZ',origin=(-4,0,0))
r=w0.sketch().segment((-38,38),(-31,3)).arc((-7,30),(27,15)).segment((20,50)).close().assemble().reset().face(w0.sketch().segment((-27,-15),(-20,-50)).segment((38,-38)).segment((31,-3)).arc((7,-30),(-27,-15)).assemble()).finalize().extrude(8)