character majority voting

cmv.py

def CharMajVoting(words):

    def most_frequent(list_):
        counter = Counter(list_)
        return counter.most_common()[0][0]
    dict_ = defaultdict(list)
    lengths = [len(word) for word in words]
    common_length = most_frequent(lengths)
    for word in words:
        for i in range(len(word)):
            dict_[i].append(word[i])

    str_=''
    for i in range(len(dict_)):
        str_+=most_frequent(dict_[i])
    return str_[:common_length]