word counter

word_counter.py

from itertools import groupby


def word_counter(*words):
    '''Write a Python program that inputs a list of words, separated by white-
    space, and outputs how many times each word appears in the list.
    '''
    return {word: len(list(word_group)) for word, word_group in
            groupby(sorted(words), key=lambda x: x)}

Outra versão ainda mais simples:

import collections


def word_counter(*string):
    return dict(collections.Counter(string).items())