code: def subtasks(self, task, params={}, **options): 
          
          path = "/tasks/%s/subtasks" % (task)
          return self.client.get_collection(path, params, **options)
docs: Returns a compact representation of all of the subtasks of a task.
  
          Parameters
          ----------
          task : {Id} The task to get the subtasks of.
          [params] : {Object} Parameters for the request