python中parse的action = store_true含义

 我们在python脚本中经常看到 action = "store_true，如下图：

parser.add_argument(
    '--image', default=False, action="store_true",
    help='Image detection mode, will ignore all positional arguments'
)

如果运行代码时加了   --image ，那么 image为true

如果没加 --image，那么image为False

这种写法通常用于判断，如下：

    if FLAGS.image:  # 用于判断
        """
        Image detection mode, disregard any remaining command line arguments
        """
        print("Image detection mode")
        if "input" in FLAGS:
            print(" Ignoring remaining command line arguments: " + FLAGS.input + "," + FLAGS.output)
        detect_img(YOLO(**vars(FLAGS)))
    elif "input" in FLAGS:
        detect_video(YOLO(**vars(FLAGS)), FLAGS.input, FLAGS.output)
    else:
        print("Must specify at least video_input_path.  See usage with --help.")