parent_bone expects a string, the bone name.
object.parent_bone = "hips"
Have object/s selected, armature active in pose mode, parent bone selected
bpy.context.active_pose_bone
bpy.ops.parent_set(type='BONE')
parent_bone expects a string, the bone name.
object.parent_bone = "hips"
Have object/s selected, armature active in pose mode, parent bone selected
bpy.context.active_pose_bone
bpy.ops.parent_set(type='BONE')