How to delete a specific message by ID using discord.py

Question

I am trying to delete a message using it's ID. I am using discord.py.

Logic Flow

User sends command. example: !message hi
Bot deletes "!message hi" using User's message ID
Bot says "hi"

I have figured out how to get it to copy my messages, but I am having difficulty getting it to delete them. I didn't want to say that it deletes the message before it's one otherwise on busy servers it might not work. I wanted to get the command message's ID then delete it using it's ID.

Answer 1

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Updated for discord.py v1.2+

You should use the TextChannel.fetch_message function.

msg = await channel.fetch_message(message_id)
await msg.delete()

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Original answer (no longer works):

To answer the question: To delete a message by ID, you must either fetch the message object (preferred) or go through client.http (not-preferred)

First option: Finding the message.

You can use the Client.get_message function

msg = await client.get_message(channel, message_id)

Alternately, your specific use case seems to just be deleting the message that was sent, so you could just use the message supplied by on_message(msg)
After you have the message, you can do:

await client.delete_message(msg)

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Second option: Using client.http

Assuming you know the channel's ID, you can simply call

await client.http.delete_message(channel_id, message_id)

This method while useful for deleting arbitrary messages in arbitrary places shouldn't be used if getting the message is feasably an option.