import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-11))
r=w0.sketch().segment((-50,-3),(-41,-6)).segment((-41,13)).close().assemble().reset().face(w0.sketch().segment((-28,41),(-21,41)).segment((-26,42)).close().assemble()).reset().face(w0.sketch().segment((22,-41),(26,-42)).segment((28,-41)).close().assemble()).reset().face(w0.sketch().segment((41,-13),(50,3)).segment((41,6)).close().assemble()).finalize().extrude(22)