@client.command(aliases={'reddit', 'hot', 'r'})
async def reddit_hot(sub):

    try:
        reddit.subreddits.search_by_name(sub, exact=True)
        if reddit.subreddit(sub).over18:
            await client.say("NSFW subreddit, please try again.")
        else:
            post = next(x for x in reddit.subreddit(sub).hot() if not x.stickied)
            await client.say(post.url)
    except prawcore.exceptions.NotFound:
        await client.say("Sorry, that subreddit does not exist!")