当命令在 discord.py 中缺少必需参数时如何显示消息

Question

我正在尝试使用随机答案生成器制作一个 8ball 命令，但我想添加一个事件，如果您只说“&8ball”，它会说“8ball 需要一个问题”

这是我使用的代码：

@client.command(aliases=['8b','8B','8Ball','b','B','8ball','Ball'])
@cooldown(1, 7, BucketType.user)
async def ball(ctx, *, question):
    embed = discord.Embed(title="????shaking the magic 8ball", colour=ctx.author.colour)
    responses = [line.strip() for line in open('8ball.txt')]
    choices = random.choice(responses)
    embed2 = discord.Embed(title="????the magic 8ball says " + choices, colour=ctx.author.colour)
    message = await ctx.send(embed=embed)
    await asyncio.sleep(5)
    await message.edit(embed=embed2)

这是我要添加的内容：

    embed3 = discord.Embed(title="????The magic 8ball requires a question", colour=ctx.author.colour)
    embed.add_field(text="Brody Foxx")
    await ctx.send(embed=embed3)

我也尝试使用 if 和 else 语句

if question in message.content:

类似的东西，试着在谷歌和 YouTube 上找遍了，我要么找不到任何东西，要么它们都在 python 中重写，所以我（再一次）求助于堆栈溢出。谢谢你的帮助，如果你帮助了我，谢谢。

Answer 1

使用错误处理程序检查是commands.MissingRequiredArgument 的错误实例，并且字段需要名称和值而不仅仅是名称。

你可能想要一个页脚

@client.command(aliases=['8b','8B','8Ball','b','B','8ball','Ball'])
@cooldown(1, 7, BucketType.user)
async def ball(ctx, *, question):
    embed = discord.Embed(title="?shaking the magic 8ball", colour=ctx.author.colour)
    responses = [line.strip() for line in open('8ball.txt')]
    choices = random.choice(responses)
    embed2 = discord.Embed(title="?the magic 8ball says " + choices, colour=ctx.author.colour)
    message = await ctx.send(embed=embed)
    await asyncio.sleep(5)
    await message.edit(embed=embed2)
@ball.error
async def ball_error(ctx, error):
    if isinstance(error, commands.MissingRequiredArgument):
        embed3 = discord.Embed(title="?The magic 8ball requires a question", colour=ctx.author.colour)
        embed3.set_footer(text="Brody Foxx")
        await ctx.send(embed=embed3)
    else: raise(error)

Answer 2

如果要求不能通过，可以简单的添加None，可以像下面这样使用：

@client.command(aliases=['8b','8B','8Ball','b','B','8ball','Ball'])
@cooldown(1, 7, BucketType.user)
async def ball(ctx, *, question=None):
    
    if question == None:
        embed3 = discord.Embed(title="?The magic 8ball requires a question", colour=ctx.author.colour)
        embed.add_field(text="Brody Foxx")
        await ctx.send(embed=embed3)
        return

    embed = discord.Embed(title="?shaking the magic 8ball", colour=ctx.author.colour)
    responses = [line.strip() for line in open('8ball.txt')]
    choices = random.choice(responses)
    embed2 = discord.Embed(title="?the magic 8ball says " + choices, colour=ctx.author.colour)
    message = await ctx.send(embed=embed)
    await asyncio.sleep(5)
    await message.edit(embed=embed2)