@commands.command(pass_context=True)
    async def leaderboard(self, ctx, users):
        with open('users.json', 'r') as f:
            users = json.load(f)
        sorted(users, key=lambda x : users[x].get('xp', 0), reverse=True)
        high_score_list = sorted(users, key=lambda x : users[x].get('xp', 0), reverse=True)
        message = ''
        for number, user in enumerate(high_score_list):
            message += '{0}. {1} with {2}xp\n'.format(number + 1, user, users[user].get('xp', 0))
            await self.client.say("{0}. {1} with {2}xp\n".format(number + 1, user, users[user].get('xp', 0)))