[Python] Python putting multiple arguments inside a mutually exclusive group

I want to achieve something like this,

usage: main.py [-h] [--video_link video | --channel_link channel --num_vids num ]


The option --num_vids is only needed if I'm using --channel_link option.

I could only come with this,

parser = argparse.ArgumentParser(
description='A Python script to download Youtube videos')
group_ = parser.add_mutually_exclusive_group()
group_.add_argument('--video_link',
metavar='video',
type=str,
help='Enter the video url')
group_.add_argument('--channel_link',
metavar='channel_link',
type=str,
help='Enter the name of the channel')
args = parser.parse_args()
video_link = args.video_link
channel_link = args.channel_link
print(video_link, channel_link)


How do I implement the desired functionality?

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