background_task.py 不显示消息 - Python

2022-01-15 00:00:00 python python-asyncio spyder discord.py

问题描述

我注意到，当我从 discord.py Github 页面运行代码片段时，它没有显示预期的消息.

I noticed that when I ran a code snippet from the discord.py Github page it didn't show the intended message.

我稍作修改的代码:

import discord
import asyncio

import nest_asyncio
nest_asyncio.apply()

class MyClient(discord.Client):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # create the background task and run it in the background
        self.bg_task = self.loop.create_task(self.my_background_task())

    async def on_ready(self):
        print('Logged in as')
        print(self.user.name)
        print(self.user.id)
        print('------')

    async def my_background_task(self):
        counter = 0
        channel = self.get_channel(1234567890) # channel ID goes here
        while not self.is_closed():
            counter += 1
            await channel.send(counter)
            await asyncio.sleep(10) # task runs every 10 seconds


client = MyClient()
client.run('token')

当我检查 Discord 时没有显示任何内容，但它确实在 IDLE 中显示输出:

When I check Discord nothing shows, however it does show output in the IDLE:

Logged in as
bot_name
1234567890
------

但在 Discord 服务器中，什么也没有发生.有没有办法解决这个问题?

But in the Discord server, nothing happens. Is there anyway to fix this?

解决方案

代码失败，因为 self.get_channel(1234567890) 在 bot 正确连接之前使用，导致它总是返回 无.这是因为先完成client = MyClient()，即后台任务已创建但bot尚未连接，这是通过client.run完成的.

The code fails because self.get_channel(1234567890) is used before the bot has properly connected, resulted in it always returning None. This is because client = MyClient() is done first, meaning the background task is created but the bot has not yet connected, which is done through client.run.

要解决此问题，请将循环的创建移至 on_ready 事件内部.

To fix this, move the creation of the loop to inside the on_ready event.

import discord
import asyncio

import nest_asyncio
nest_asyncio.apply()

class MyClient(discord.Client):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

    async def on_ready(self):
        print('Logged in as')
        print(self.user.name)
        print(self.user.id)
        print('------')

        # create the background task and run it in the background
        self.bg_task = self.loop.create_task(self.my_background_task())

    async def my_background_task(self):
        counter = 0
        channel = self.get_channel(1234567890) # channel ID goes here
        while not self.is_closed():
            counter += 1
            await channel.send(counter)
            await asyncio.sleep(10) # task runs every 10 seconds


client = MyClient()
client.run('token')

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