code: def get_tasks(task_id='', completed=True):
      
  
      client = mesos.DCOSClient()
      master = mesos.Master(client.get_master_state())
      mesos_tasks = master.tasks(completed=completed, fltr=task_id)
      return [task.__dict__['_task'] for task in mesos_tasks]
docs: Get a list of tasks, optionally filtered by task id.
          The task_id can be the abbrevated.  Example: If a task named 'sleep' is
          scaled to 3 in marathon, there will be be 3 tasks starting with 'sleep.'
  
          :param task_id: task ID
          :type task_id: str
          :param completed: include completed tasks?
          :type completed: bool
  
          :return: a list of tasks
          :rtype: []