Feel free to use this however you want, but if code from this is published, please give credit :)

comikaze.py

#! /usr/env python3

# Dependencies:
# discord.py https://github.com/Rapptz/discord.py
# requests   http://docs.python-requests.org/en/master/

import discord
import asyncio
import requests
import json
from io import BytesIO

client = discord.Client()

@client.event
async def on_ready():
    await client.change_status(discord.Game(name="¡xkcd or ¡xkcd <num>", url="http://github.com/myrkvi/", type=1))
    print("Logged in as:", client.user.name, client.user.id)
    print("------------------------------")

@client.event
async def on_message(message):
    if message.content.startswith("¡xkcd") or message.content.startswith("ixkcd"):
        msg = message.content.split(" ")
        await client.send_typing(message.channel)


        if len(msg) > 1:
            num = msg[1]
            r = requests.get("http://xkcd.com/" + num +"/info.0.json")
            if r.status_code != 200:
                await client.send_message(message.channel, "`{}` is an invalid argument!".format(num))
                return

        else:
            r = requests.get("http://xkcd.com/info.0.json")

        rJson = r.json()

        date = "{}-{}-{}".format(rJson["year"], rJson["month"], rJson["day"])
        title = rJson["title"]
        image = rJson["img"]
        alt = rJson["alt"]
        num = rJson["num"]

        await client.send_file(message.channel, BytesIO(requests.get(image).content), filename="{}.png".format(num))
        await client.send_message(message.channel, "({}) **{}**  {}\n\"{}\"".format(num, title, date, alt))

client.run("<TOKEN>")