python test case solution

def count_common_words(text):
    word_counter = {}
    most_populr_word = tuple()  # (word, count)

    for word in  text.split():


        word_counter.setdefault(word, 0)
        word_counter[word] += 1


        if most_populr_word:
            if word_counter.get(word) > most_populr_word[1]:
                most_populr_word = (word, word_counter[word])
        else:
            most_populr_word = (word, word_counter[word])

    print(sorted(word_counter.items(), key=lambda kv: kv[1], reverse=True))[:11]
    print(most_populr_word[0])

count_common_words(text)