在异步函数中使用全局变量不起作用

Question

我的程序应该做的是在用户输入〜modmail的不和谐服务器中。 然后，此消息到达其dm：

然后，用户应在dm中回答指定的问题。然后将所有这些信息发送到原始服务器中的特定名称通道。

现在是问题所在： 全局变量无法在新的on_message函数中使用：

    name = "reports-log"
    channel = get(message.server.channels, name=name, type=discord.ChannelType.text)
    original = message.author

    dm_embed=discord.Embed(title="Modmail/Support:", color=discord.Color.green(), description=" ")
    dm_embed.add_field(name="Please declare your problem/question and send it in this channel!", value="**Question must be on one message**\n*You can make a new line if you press Shift + Enter*")
    dm_embed.set_footer(text="Valid for 1 minute")
    await client.send_message(message.author, embed=dm_embed)

    @client.event
    async def on_message(message):
        if message.server is None and message.author != client.user:
            global channel
            global original

            question = message.content

            report_embed = discord.Embed(title="New Modmail:" , color=discord.Color.green())
            report_embed.add_field(name="User: ", value=message.author.mention)
            report_embed.add_field(name="Question: ", value=question)

            await client.send_message(channel, embed=report_embed)

            await client.send_message(original, embed=discord.Embed(color=discord.Color.green(), description="Your support request has been recieved, you will recieve help shortly."))

不确定为什么这些变量不能在我的函数中使用。希望有人对我有解决方案。谢谢。

Answer 1

与其尝试将全局变量用于需要上下文隔离的函数，不如尝试使它们保持同一运行。
如果第二位用户在此过程中尝试发送Modmail，则最终将用第二位用户覆盖original全局。

如您对问题的评论中所述，可以使用client.wait_for_message而不是全局变量来解决您的问题。

第二个问题是您试图通过搜索客户端的缓存在全局范围内定义不和谐变量，直到您调用client.run()或首选的启动机制后，这些缓存才会被填充。

# You can still store a global channel, but must find it after you start
@client.event
async def on_ready():
    # This is only called once the client has downloaded all its data.
    global channel
    channel = get(...)

def message_mods(message):
    request = await client.send_message(message.author, ....)

    response = await client.wait_for_message(60,
        author = message.author,
        channel = request.channel
    )

    # Generate report embed using the `response` object
    e = discord.Embed(title="New modmail.", colour=discord.Colour.green(),
                      description=response.content)
    e.set_author(name=response.author.name, icon_url=response.author.avatar_url)

    # Use the channel found in on_message, no need for global
    # because we didn't redefine channel at all.
    client.send_message(channel, embed=e)

    # Reply to the user
    client.send_message(response.channel, ...)