使用 Python 在 400 空消息代码中打印变量输出

Question

问题：我正在尝试为 Discord 编写一个机器人，以便获取一个变量并将其作为消息发送。例如，“a”设置为 42，我希望机器人在聊天中打印“The number is 42 {author name}”：a = 32if message.content.startswith('!gap'):    msg = print('a'.format(message))    await client.send_message(message.channel, msg)错误：Ignoring exception in on_messageTraceback (most recent call last):  File "C:\Users\trevo\AppData\Local\Programs\Python\Python36-32\lib\site-packages\discord\client.py", line 307, in _run_event    yield from getattr(self, event)(*args, **kwargs)  File "C:\Users\trevo\Desktop\dcbot\reply.py", line 16, in on_message    await client.send_message(message.channel, msg)  File "C:\Users\trevo\AppData\Local\Programs\Python\Python36-32\lib\site-packages\discord\client.py", line 1152, in send_message    data = yield from self.http.send_message(channel_id, content, guild_id=guild_id, tts=tts, embed=embed)  File "C:\Users\trevo\AppData\Local\Programs\Python\Python36-32\lib\site-packages\discord\http.py", line 200, in request    raise HTTPException(r, data)discord.errors.HTTPException: BAD REQUEST (status code: 400): Cannot send an empty message我很欣赏解释！

Answer 1

您希望msg是一个字符串，但如果您尝试：

>>> msg = print("anything at all")

>>> repr(msg)

None

只需删除print呼叫。

Answer 2

您不应该使用 on_message 事件来发出命令。改用内置命令处理程序，这样可以提高程序设计和效率。

以下代码输出您在!gap后键入的数字

from discord.ext import commands

client = commands.Bot(command_prefix='!')

@client.command(pass_context=True)

async def gap(ctx, number):

    await client.say(f"{ctx.author.mention} said the number {number}")

client.run("token")

我还建议查看 API 的重写分支，它有很多改进。