code: def set_parent(self, task_id, params={}, **options):
          
          path = '/tasks/%s/setParent' % (task_id)
          return self.client.post(path, params, **options)
docs: Changes the parent of a task. Each task may only be a subtask of a single
          parent, or no parent task at all. Returns an empty data block.
  
          Parameters
          ----------
          task : {Id} Globally unique identifier for the task.
          [data] : {Object} Data for the request
            - parent : {Id} The new parent of the task, or `null` for no parent.