pride_and_palindrome.py

import string
import nltk.data

def reverse(sentence):
  return sentence[::-1]

def stripped(sentence):
  return "".join(sentence.split())

def scrubbed(sentence):
  return sentence.lower().translate(None, string.punctuation)

def is_palindrome(sentence):
  stripped_string = stripped(scrubbed(sentence))
  return stripped_string == reverse(stripped_string)

def text():
  return open("moby_dick.txt").read()

def sentences(text):
  sentence_detector = nltk.data.load('tokenizers/punkt/english.pickle')
  return sentence_detector.tokenize(text.strip())

def palindromes(sentences):
  return filter(is_palindrome, sentences)

def main():
  print palindromes(sentences(text()))

if __name__ == '__main__':
  main()