开发Discord Bot时.env文件TOKEN读取失败问题求助

问题 #

我在main.py同级目录创建了.env文件，原本以为运行main.py时会自动加载该文件，让Discord Bot正常启动，但实际并未生效，运行后报错。

我的代码 #

import discord
import os


client = discord.Client(intents=discord.Intents.default())

@client.event
async def on_ready():
  print('We have loggined in as {0.user}'.format(client))

@client.event
async def on_message(message):
  if message.author == client.user:
    return

  if message.content.startswith('/hello'):
    await message.channel.send('Hello')

client.run(os.getenv('TOKEN'))

运行报错信息 #

Traceback (most recent call last):
File "c:\Users\User\Desktop\python_work\main.py", line 19, in 
client.run(os.getenv('TOKEN'))
File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\site-packages\discord\client.py", line 860, in run
asyncio.run(runner())
File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 190, in run
return runner.run(main)
^^^^^^^^^^^^^^^^
File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\asyncio\runners.py", line 118, in run
return self._loop.run_until_complete(task)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\asyncio\base_events.py", line 653, in run_until_complete
return future.result()
^^^^^^^^^^^^^^^
File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\site-packages\discord\client.py", line 849, in runner
await self.start(token, reconnect=reconnect)
File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\site-packages\discord\client.py", line 777, in start
await self.login(token)
File "C:\Users\User\AppData\Local\Programs\Python\Python311\Lib\site-packages\discord\client.py", line 609, in login
raise TypeError(f'expected token to be a str, received {token.__class__.__name__} instead')
TypeError: expected token to be a str, received NoneType instead
PS C:\Users\User>

解决步骤 #

• 安装python-dotenv库：Python默认不会自动读取.env文件，需要依赖这个第三方库，执行命令：

  pip install python-dotenv
  

• 修改代码加载.env文件：在代码开头添加加载逻辑，修改后的代码如下：

  import discord
  import os
  from dotenv import load_dotenv
  
  # 加载同级目录的.env文件
  load_dotenv()
  
  client = discord.Client(intents=discord.Intents.default())
  
  @client.event
  async def on_ready():
    print('We have loggined in as {0.user}'.format(client))
  
  @client.event
  async def on_message(message):
    if message.author == client.user:
      return
  
    if message.content.startswith('/hello'):
      await message.channel.send('Hello')
  
  client.run(os.getenv('TOKEN'))
  

• 检查.env文件格式：确保文件内容为TOKEN=你的机器人令牌，注意不要给令牌加引号，也不要在等号前后加多余空格。

内容的提问来源于stack exchange，提问作者Becky