Créer des phrases avec une chaîne markov en python

Question

Je suis un noob en python et j'ai besoin de votre aide. J'ai un code qui utilise des chaînes markov pour genarate phrases, mais pour le code fonctionne je dois définir 2 mots de départ, mais je veux que le premier mot a été choisi au hasard, pouvez-vous m'aider?

Voici le code:

import random 

def getLines(filename): 
return [line[0:-1] for line in open(filename).readlines()] 

def getWords(lines): 
words = [] 
for line in lines: 
    words.extend(line.split()) 
return words 

def createProbabilityHash(words): 
numWords = len(words) 
wordCount = {} 
for word in words: 
    if wordCount.has_key(word): 
    wordCount[word] += 1 
    else: 
    wordCount[word] = 1 

for word in wordCount.keys(): 
    wordCount[word] /= 1.0 * numWords 
return wordCount 

def getRandomWord(wordCount): 
randomValue = random.random() 
cumulative = 0.0 
choosenWord = "" 
print wordCount 
for word in wordCount: 
    probability = wordCount[word] 
    if probability > cumulative: 
     cumulative = probability 
     choosenWord = word 

return choosenWord 


words = getWords(getLines("frases.txt")) 
wordMap = {} 
previous = (words[0], words[1]) 
for word in words[2:]: 
if wordMap.has_key(previous): 
    wordMap[previous].append(word) 
else: 
    wordMap[previous] = [word] 
previous = (previous[1], word) 

for word in wordMap.keys(): 
probabilityHash = createProbabilityHash(wordMap[word]) 

wordMap[word] = probabilityHash 

palavras = ['hello', 'apple', 'something', 'yeah', 'nope', 'lalala'] 
previous = (".", "A") #Starting words 
numWords = 10 # The number of words to print 

print previous[0], previous[1], 
for i in range(numWords): 
word = getRandomWord(wordMap[previous]) 
print word, 
if word.endswith(","): 
    print "\n" 
if word.endswith("."): 
    break 

previous = (previous[1], word) 

Answer 1

Cela choisira au hasard parmi les mots dans votre dictionnaire:

import random 
previous[0] = random.choice(wordMap.keys())