import cadquery as cq
w0=cq.Workplane('YZ',origin=(21,0,0))
w1=cq.Workplane('XY',origin=(0,0,18))
r=w0.workplane(offset=-34/2).moveTo(-47,-41).cylinder(34,3).union(w1.sketch().segment((-21,28),(-17,28)).segment((-17,10)).segment((-13,10)).segment((-13,28)).segment((-12,28)).segment((-12,31)).segment((-13,31)).segment((-13,50)).segment((-17,50)).segment((-17,31)).segment((-21,31)).close().assemble().finalize().extrude(27))