如何从discord.py中的提及中吸引用户？

Question

我的命令有问题，由于某种原因，该命令昨晚起作用，但现在仅当我提及自己的用户名时，该命令才起作用。我可以正确使用user=message.mentions[0]吗？

@client.async_event
async def on_message(message):
    if message.author == client.user:
        return
    elif message.content.startswith('!punch'):
        user = message.mentions[0]
        responses = ['DANG ' + user.mention + ' just got punched!', 'LOOK OUT ' + user.mention + ' just got knocked out! ლ(ಠ益ಠლ)', 'trong uppercut right in ' + user.mention + 's chin']
        choice = random.choice(responses)
        await client.send_message(message.channel, choice)