discord.py音乐播放Cog多命令别名功能代码修复求助

你代码里存在多个语法错误和discord.py Cog规范使用错误，按以下方式修改即可正常使用双别名触发播放命令： #

核心修改点 #

• Cog类内部定义命令不能使用@client.command()装饰器，统一替换为@commands.command()
• 命令别名直接通过装饰器的aliases参数配置，你写的async def {playcmd}属于无效Python语法，不需要通过变量拼接函数名
• Cog类内的所有方法第一个参数必须是self，你原有代码里所有命令函数都缺失该参数，运行会直接报错
• 修正代码缩进问题，Python对缩进要求严格，原有__init__方法缩进不匹配会触发语法错误

修改后完整代码 #

import discord
from discord.ext import commands
import youtube_dl
from urllib import parse, request
import re

class music(commands.Cog):
    def __init__(self, client):
        self.client = client

    @commands.command()
    async def join(self, ctx):
        if ctx.author.voice:
            channel = ctx.message.author.voice.channel
            await channel.connect()
        else:
            await ctx.send("First join voice channel")

    @commands.command()
    async def leave(self, ctx):
        if ctx.voice_client:
            await ctx.guild.voice_client.disconnect()
            await ctx.send("Ok")
     
    # 这里配置命令别名，aliases里的内容都可以触发该命令
    @commands.command(name="play", aliases=["p"])
    async def play(self, ctx, *, search):
        if ctx.voice_client:
            print("already on voice channel")
        else:
            channel = ctx.message.author.voice.channel
            await channel.connect()

        query_string = parse.urlencode({'search_query': search})
        html_content = request.urlopen('http://www.youtube.com/results?' + query_string)
        search_content= html_content.read().decode()
        search_results = re.findall(r'\/watch\?v=\w+', search_content)
        await ctx.send('Now playing: https://www.youtube.com' + search_results[0])

        url = 'https://www.youtube.com' + search_results[0]

        ctx.voice_client.stop()
        FFMPEG_OPTIONS = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'}
        YDL_OPTIONS = {'format':"bestaudio"}
        vc = ctx.voice_client

        with youtube_dl.YoutubeDL(YDL_OPTIONS) as ydl:
            info = ydl.extract_info(url, download=False)
            url2 = info['formats'][0]['url']
            source = await discord.FFmpegOpusAudio.from_probe(url2, **FFMPEG_OPTIONS)
            vc.play(source)

    @commands.command()
    async def pause(self, ctx):
       await ctx.send("paused")
       await ctx.voice_client.pause()

    @commands.command()
    async def resume(self, ctx):
        await ctx.send("resumed")
        await ctx.voice_client.resume()

    @commands.command()
    async def youtube(self, ctx, *, search):
      query_string = parse.urlencode({'search_query': search})
      html_content = request.urlopen('http://www.youtube.com/results?' + query_string)
      search_content= html_content.read().decode()
      search_results = re.findall(r'\/watch\?v=\w+', search_content)
      await ctx.send('https://www.youtube.com' + search_results[0])

def setup(client):
    client.add_cog(music(client))

内容的提问来源于stack exchange，提问作者sionka