code: def get_task(self, task_id):
          
          task = self.request_single('GetTask', {'id': task_id})
  
          if task:
              return zobjects.Task.from_dict(task)
          else:
              return None
docs: Retrieve one task, discriminated by id.
  
          :param: task_id: the task id
  
          :returns: a zobjects.Task object ;
                    if no task is matching, returns None.