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"""This module contains a code example related to

Think Python, 2nd Edition

by Allen Downey

http://thinkpython2.com

Copyright 2015 Allen Downey

License: http://creativecommons.org/licenses/by/4.0/

"""

from __future__ import print_function, division

def is_triple_double(word):

"""Tests if a word contains three consecutive double letters.

word: string

returns: bool

"""

i = 0

count = 0

while i < len(word)-1:

if word[i] == word[i+1]:

count = count + 1

if count == 3:

return True

i = i + 2

else:

i = i + 1 - 2*count

count = 0

return False

def find_triple_double():

"""Reads a word list and prints words with triple double letters."""

fin = open('words.txt')

for line in fin:

word = line.strip()

if is_triple_double(word):

print(word)

print('Here are all the words in the list that have')

print('three consecutive double letters.')

find_triple_double()

print('')