import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-62))
r=w0.sketch().circle(100).reset().face(w0.sketch().segment((-10,-49),(-10,49)).arc((-50,0),(-10,-49)).assemble(),mode='s').reset().face(w0.sketch().arc((10,-49),(50,0),(10,49)).close().assemble(),mode='s').finalize().extrude(125)