Discord.py(v 1.5.0): TypeError: can't send non-None value to a just-started generator

Question

所以我試圖制作一個 discord 機器人，我想制作一個向所有頻道發送消息的命令。

    @client.command(pass_context = True)
async def send_all(ctx):
    channel = client.get_all_channels()
    await channel.send("I sent this to all channels")

起初（當我讓機器人在線時），沒有錯誤。 但是當我運行命令時，在 discord 和控制台中沒有出現 output 出現：

Traceback (most recent call last):
  File "C:\Users\User\anaconda3\lib\site-packages\discord\ext\commands\bot.py", line 903, in invoke
    await ctx.command.invoke(ctx)
  File "C:\Users\User\anaconda3\lib\site-packages\discord\ext\commands\core.py", line 859, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "C:\Users\User\anaconda3\lib\site-packages\discord\ext\commands\core.py", line 94, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: TypeError: can't send non-None value to a just-started generator

Answer 1

for channel in client.get_all_channels():
    # get_all_channels also include voice channels, just check if it's not
    if isinstance(channel, discord.TextChannel):
        await channel.send('whatever')

你也可以：

for guild in client.guilds:
    for channel in guild.text_channels:
        await channel.send('whatever')

Bot.get_all_channels產生GuildChannel obj - 意味着它是一個迭代器，要了解有關迭代器的更多信息，請查看此答案

參考：

• Bot.get_all_channels
• Bot.guilds
• Guild.text_channels