def list2counts(duplist, hash):
    countdict = {}
    for d in duplist:
        if hash(d) in countdict:
            countdict[hash(d)]['count'] += 1
        else:
            countdict[hash(d)] = {'count': 1, 'item': d}
    return countdict

def list2countstuple(duplist, hash):
    return ((v['item'], v['count']) for v in
            list2counts(duplist, hash).values())

def joinordie(joinstr, diestr):
    return joinstr % diestr if diestr else ''

def flatten(lst):
    for elem in lst:
        if type(elem) in (tuple, list):
            for i in flatten(elem):
                yield i
        else:
            yield elem