Count and Say problem: http://www.rubyquiz.com/quiz138.html

count_and_say.py

class CountAndSay:
    def say(self, word):
        numbers = {1:"one", 2:"two", 3:"three"}
        say = ""
        while len(word) > 0:
            it = iter(word)
            letter = it.next()
            if letter is not " ":
                say += numbers[word.count(letter)] + " " + letter + " "
            word = word.replace(letter, "")
        return say

test_count_and_say.py

import unittest
from count_and_say import CountAndSay
from nose.tools import *

class CountAndSayTestCase(unittest.TestCase):
    def test_if_look_retrieve_one_k_one_l_two_o(self):
        word = CountAndSay()
        assert_equals(word.say("look"), "one l two o one k ")

    def test_if_look_and_say_does_not_count_blank_spaces(self):
        word = CountAndSay()
        assert_equals(word.say("look and say"), "one l two o one k two a one n one d one s one y ")

    def test_if_an_randomic_phrase_return_the_expected(self):
        word = CountAndSay()
        assert_equals(word.say("an randomic phrase"), "three a two n two r one d one o one m one i one c one p one h one s one e ")