正向最大匹配

# -*- coding:utf-8 -*- CODEC='utf-8' def u(s, encoding): 'converted other encoding to unicode encoding' if isinstance(s, unicode): return s else: return unicode(s, encoding) def fwd_mm_seg(wordDict, maxLen, str): 'forward max match segment' wordList = [] segStr = str segStrLen = len(segStr) for word in wordDict: print 'word: ', word print "\n" while segStrLen > 0: if segStrLen > maxLen: wordLen = maxLen else: wordLen = segStrLen subStr = segStr[0:wordLen] print "subStr: ", subStr while wordLen > 1: if subStr in wordDict: print "subStr1: %r" % subStr break else: print "subStr2: %r" % subStr wordLen = wordLen - 1 subStr = subStr[0:wordLen]# print "subStr3: ", subStr wordList.append(subStr) segStr = segStr[wordLen:] segStrLen = segStrLen - wordLen for wordstr in wordList: print "wordstr: ", wordstr return wordList def main(): fp_dict = open('words.dic') wordDict = {} for eachWord in fp_dict: wordDict[u(eachWord.strip(), 'utf-8')] = 1 segStr = u'你好世界hello world' print segStr wordList = fwd_mm_seg(wordDict, 10, segStr) print "==".join(wordList) if __name__ == '__main__': main()

逆向最大匹配

# -*- coding:utf-8 -*- def u(s, encoding): 'converted other encoding to unicode encoding' if isinstance(s, unicode): return s else: return unicode(s, encoding) CODEC='utf-8' def bwd_mm_seg(wordDict, maxLen, str): 'forward max match segment' wordList = [] segStr = str segStrLen = len(segStr) for word in wordDict: print 'word: ', word print "\n" while segStrLen > 0: if segStrLen > maxLen: wordLen = maxLen else: wordLen = segStrLen subStr = segStr[-wordLen:None] print "subStr: ", subStr while wordLen > 1: if subStr in wordDict: print "subStr1: %r" % subStr break else: print "subStr2: %r" % subStr wordLen = wordLen - 1 subStr = subStr[-wordLen:None]# print "subStr3: ", subStr wordList.append(subStr) segStr = segStr[0: -wordLen] segStrLen = segStrLen - wordLen wordList.reverse() for wordstr in wordList: print "wordstr: ", wordstr return wordList def main(): fp_dict = open('words.dic') wordDict = {} for eachWord in fp_dict: wordDict[u(eachWord.strip(), 'utf-8')] = 1 segStr = ur'你好世界hello world' print segStr wordList = bwd_mm_seg(wordDict, 10, segStr) print "==".join(wordList) if __name__ == '__main__': main()

以上这篇python正向最大匹配分词和逆向最大匹配分词的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。