如果要重復(fù)執(zhí)行此操作，應(yīng)創(chuàng)建一個索引：wordlist = [word.strip() for word in "run, ran, rat, rob, fish, tree".split(',')]

from collections import defaultdict

class Index(object):

def __init__(self, wordlist=()):

self.trie = defaultdict(set)

for word in wordlist:

self.add_word(word)

def add_word(self, word):

""" adds word to the index """

# save the length of the word

self.trie[len(word)].add(word)

for marker in enumerate(word):

# add word to the set of words with (pos,char)

self.trie[marker].add(word)

def find(self, pattern, wildcard='-' ):

# get all word with matching length as candidates

candidates = self.trie[len(pattern)]

# get all words with all the markers

for marker in enumerate(pattern):

if marker[1] != wildcard:

candidates &= self.trie[marker]

# exit early if there are no candicates

if not candidates:

return None

return candidates

with open('dict.txt', 'rt') as lines:

wordlist = [word.strip() for word in lines]

s = Index(wordlist)

print s.find("r--")

Tries用于搜索字符串。這是一個簡單的前綴trie，使用一個dict

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