docs: def execute(self, env, args):
          """ Prints task information.
  
              `env`
                  Runtime ``Environment`` instance.
              `args`
                  Arguments object from arg parser.
              """
  
          task_name = args.task_name
  
          if task_name is None:
              if not env.task.active:
                  raise errors.NoActiveTask
              task_name = env.task.name
  
          tasks = env.task.get_list_info(task_name)
          if not tasks:
              raise errors.TaskNotFound(task_name)
  
          _print_tasks(env, tasks)