bot.py

# Import discord.py
import discord
import asyncio

client = discord.Client()


@client.event
async def on_ready():

    print("Bot is ready!")


@client.event
async def on_message(message):

    print("Message was", message.content)

    if message.content.startswith("--yt"):

        await client.send_message(message.channel, "youtube.com")

    elif message.content.startswith("--???"):

        await client.send_message(message.channel, "http://i3.kym-cdn.com/photos/images/facebook/000/993/875/084.png")

client.run("token")