import random class Markov(object):   def __init__(self, open_file):  self.cache = {}  self.open_file = open_file  self.words = self.file_to_words()  self.word_size = len(self.words)  self.database()      def file_to_words(self):  self.open_file.seek(0)  data = self.open_file.read()  words = data.split()  return words      def triples(self):  """ Generates triples from the given data string. So if our string were    "What a lovely day", we'd generate (What, a, lovely) and then    (a, lovely, day).  """     if len(self.words) < 3:   return     for i in range(len(self.words) - 2):   yield (self.words[i], self.words[i+1], self.words[i+2])     def database(self):  for w1, w2, w3 in self.triples():   key = (w1, w2)   if key in self.cache:    self.cache[key].append(w3)   else:    self.cache[key] = [w3]      def generate_markov_text(self, size=25):  seed = random.randint(0, self.word_size-3)  seed_word, next_word = self.words[seed], self.words[seed+1]  w1, w2 = seed_word, next_word  gen_words = []  for i in xrange(size):   gen_words.append(w1)   w1, w2 = w2, random.choice(self.cache[(w1, w2)])  gen_words.append(w2)  return ' '.join(gen_words)

In [1]: file_ = open('/home/shabda/jeeves.txt') In [2]: import markovgen In [3]: markov = markovgen.Markov(file_) In [4]: markov.generate_markov_text()Out[4]: 'Can you put a few years of your twin-brother Alfred,who was apt to rally round a bit. I should strongly advocatethe blue with milk'

{('The', 'quick'): ['brown'], ('brown', 'fox'): ['jumps', 'who', 'who'], ('fox', 'jumps'): ['over'], ('fox', 'who'): ['is', 'is'], ('is', 'slow'): ['jumps'], ('jumps', 'over'): ['the', 'the'], ('over', 'the'): ['brown', 'brown'], ('quick', 'brown'): ['fox'], ('slow', 'jumps'): ['over'], ('the', 'brown'): ['fox', 'fox'], ('who', 'is'): ['slow', 'dead.']}