import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-50,0))
r=w0.workplane(offset=45/2).cylinder(45,11).union(w0.sketch().segment((-44,-27),(44,-27)).segment((44,27)).segment((26,27)).arc((-2,19),(-30,27)).segment((-44,27)).close().assemble().finalize().extrude(100))