Discord.py音乐bot，使用文本文件保存音量整数，但我得到ValueError：int（）的无效文字，基数为10：”

Question

I've been trying to make a Discord.py bot. While modifying some of the base code for the music portion to store the volume in a text file(so it's consistent everytime it plays a new song) and I ran into some problems.

ValueError: invalid literal for int() with base 10: ''

Here's my code for the relevant portion:

@commands.command(pass_context=True, no_pm=True)
    async def volume(self, ctx, value: int):
        """Sets the volume of the currently playing song."""

        state = self.get_voice_state(ctx.message.server)
        with open(r'E:\PythonProjects\WeebBot\textfiles\volumefile.txt', 'r+') as volumefile:
            open(r'E:\PythonProjects\WeebBot\textfiles\volumefile.txt', 'w')
            volumefile.write(str(value))
            if state.is_playing():
                read_data = volumefile.read()
                player = state.player
                player.volume = int(read_data.rstrip('\n')) / 100
                await self.bot.say('Set the volume to {:.0%}'.format(player.volume))
        volumefile.close()

I've tried using floats (player.volume uses 0.1 to 2.0 as values for volume from 1% to 200%) and I think I also delete any \\n chars that might show up at the end of the file. I'm only reading ints all bunched up so I don't believe I need to do anything else?

Answer 1

You don't need to read the value from the file, since the content of the text file is always value .

@commands.command(pass_context=True, no_pm=True)
async def volume(self, ctx, value: int):
    """Sets the volume of the currently playing song."""

    state = self.get_voice_state(ctx.message.server)
    with open(r'E:\PythonProjects\WeebBot\textfiles\volumefile.txt', 'w') as volumefile:
        volumefile.write(str(value))
    if state.is_playing():
        player = state.player
        player.volume = value / 100
        await self.bot.say('Set the volume to {:.0%}'.format(player.volume))

If you still want to read from the file, you need to re-open the file with r permission.