How to use the pmxbot.karma.Karma.store.change function in pmxbot

def karma(nick, rest):
    "Return or change the karma value for some(one|thing)"
    karmee = rest.strip('++').strip('--').strip('~~')
    if '++' in rest:
        Karma.store.change(karmee, 1)
    elif '--' in rest:
        Karma.store.change(karmee, -1)
    elif '~~' in rest:
        change = random.choice([-1, 0, 1])
        Karma.store.change(karmee, change)
        if change == 1:
            return "%s karma++" % karmee
        elif change == 0:
            return "%s karma shall remain the same" % karmee
        elif change == -1:
            return "%s karma--" % karmee
    elif '==' in rest:
        t1, t2 = rest.split('==')
        try:
            Karma.store.link(t1, t2)
        except SameName:
            Karma.store.change(nick, -1)
            return "Don't try to link a name to itself!"

def disembowel(rest):
    "Disembowel some(one|thing)!"
    if rest:
        stabee = rest
        karma.Karma.store.change(stabee, -1)
    else:
        stabee = "someone nearby"
    return (
        "/me takes %s, brings them down to the basement, ties them to a "
        "leaky pipe, and once bored of playing with them mercifully "
        "ritually disembowels them..." % stabee
    )

def cheer(rest):
    "Cheer for something"
    if rest:
        karma.Karma.store.change(rest, 1)
        return "/me cheers for %s!" % rest
    karma.Karma.store.change('the day', 1)
    return "/me cheers!"

def bitchingisuseless(channel, rest):
    "It really is, ya know..."
    rest = rest.strip()
    if rest:
        karma.Karma.store.change(rest, -1)
    else:
        karma.Karma.store.change(channel, -1)
        rest = "foo'"
    advice = 'Quiet bitching is useless, %s. Do something about it.' % rest
    return advice

def emer_comp(rest):
    "Return a random compliment from http://emergencycompliment.com/"
    comps = util.load_emergency_compliments()
    compliment = random.choice(comps)
    if rest:
        complimentee = rest.strip()
        karma.Karma.store.change(complimentee, 1)
        return "%s: %s" % (complimentee, compliment)
    return compliment

def fight(nick, rest):
    "Pit two sworn enemies against each other (separate with 'vs.')"
    if rest:
        vtype = random.choice(phrases.fight_victories)
        fdesc = random.choice(phrases.fight_descriptions)
        # valid separators are vs., v., and vs
        pattern = re.compile('(.*) (?:vs[.]?|v[.]) (.*)')
        matcher = pattern.match(rest)
        if not matcher:
            karma.Karma.store.change(nick.lower(), -1)
            args = (vtype, nick, fdesc)
            return "/me %s %s in %s for bad protocol." % args
        contenders = [c.strip() for c in matcher.groups()]
        random.shuffle(contenders)
        winner, loser = contenders
        karma.Karma.store.change(winner, 1)
        karma.Karma.store.change(loser, -1)
        return "%s %s %s in %s." % (winner, vtype, loser, fdesc)

def imotivate(channel, rest):
    'Ironically "Motivate" someone'
    if rest:
        r = rest.strip()
        karma.Karma.store.change(r, -1)
    else:
        r = channel
    return '''you're "doing" "good" "work", %s!''' % r

def fight(nick, rest):
    "Pit two sworn enemies against each other (separate with 'vs.')"
    if rest:
        vtype = random.choice(phrases.fight_victories)
        fdesc = random.choice(phrases.fight_descriptions)
        # valid separators are vs., v., and vs
        pattern = re.compile('(.*) (?:vs[.]?|v[.]) (.*)')
        matcher = pattern.match(rest)
        if not matcher:
            karma.Karma.store.change(nick.lower(), -1)
            args = (vtype, nick, fdesc)
            return "/me %s %s in %s for bad protocol." % args
        contenders = [c.strip() for c in matcher.groups()]
        random.shuffle(contenders)
        winner, loser = contenders
        karma.Karma.store.change(winner, 1)
        karma.Karma.store.change(loser, -1)
        return "%s %s %s in %s." % (winner, vtype, loser, fdesc)