def walk(self, num_sentences=10):
# Get random starting point from keys
starting_points = list(filter(lambda x: x[0] is None, self.keys()))
chain = list(random.choice(starting_points))
queue = LinkedQueue(chain)
sentences = 0
while sentences < num_sentences:
prev_words = tuple(queue.items())
new_word = self[prev_words].sample()
queue.enqueue(new_word)
queue.dequeue()
if new_word is None:
sentences += 1
else:
chain.append(new_word)
phrase = []
for segment in chain[1:]:
# Word
if re.match(r'\w+', segment) is None:
phrase[-1] += segment
else:
phrase.append(segment)
result = ' '.join(phrase)
return result
