import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,50,0))
r=w0.sketch().arc((-25,-32),(-14,-38),(-1,-40)).close().assemble().reset().face(w0.sketch().segment((1,40),(25,32)).arc((14,38),(1,40)).assemble()).finalize().extrude(-100)