CODEWITHSUNDEEP
pythondiscord.py
user12652660
user12652660

Reputation:

How can I get an argument from error for discord.py?

I want to get an argument like in the image below:

enter image description here

My code:

class Admin(commands.Cog):
    def __init__(self, bot):
        self.bot = bot

    @commands.command()
    async def purge(self, ctx, amount: int):
        await ctx.channel.purge(limit=amount+1)

    @purge.error
    async def purge_error(self, ctx, error):
        if isinstance(error, commands.MissingRequiredArgument):
            await ctx.send('Please enter a number.')
        elif isinstance(error, commands.BadArgument):
            await ctx.send('This is not a number.')

How can I do it?

Upvotes: 0

Views: 2525

Answers (1)

Harmon758
Harmon758

Reputation: 5157

commands.BadArgument is not passed the inspect.Parameter that other exceptions like commands.MissingRequiredArgument have as a param attribute.

If you're trying to get the parameter name for MissingRequiredArgument, you can just use that attribute and Parameter.name.

Otherwise, BadArgument is usually passed a message. The most common case for this is a string that contains the Parameter.name in the form 'Converting to "{}" failed for parameter "{}".'.format(name, param.name) where name is the converter name and param is the Parameter, and parsing that is likely how the bot in your image is getting it. In this case, you can get this message by casting the BadArgument to a string or as the first and only argument in the tuple returned by the exception's args attribute. See Python's documentation on handling exceptions for more detail.

Note though, that BadArgument can be raised for reasons other than an integer conversion and with different or no messages, e.g. for boolean converters, Discord converters, custom converters, etc.

Upvotes: 2

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