import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-17,0))
r=w0.sketch().segment((-24,-1),(5,-1)).segment((5,-18)).segment((50,-18)).segment((50,30)).segment((5,30)).segment((5,5)).segment((-24,5)).close().assemble().finalize().extrude(-14).union(w0.sketch().arc((-50,-23),(-39,-27),(-49,-22)).segment((-48,-22)).segment((-48,-23)).close().assemble().finalize().extrude(48))