Python字符串匹配算法KMP实例

本文实例讲述了python/' target='_blank'>python字符串匹配算法KMP。分享给大家供大家参考。具体如下：

#!/usr/bin/env Python#encoding:utf8def next(pattern):p_len = len(pattern)pos = [-1]*p_lenj = -1for i in range(1, p_len):while j > -1 and pattern[j+1] != pattern[i]:j = pos[j]if pattern[j+1] == pattern[i]:j = j + 1pos[i] = jreturn posdef kmp(ss, pattern):pos = next(pattern)ss_len = len(ss)pattern_len = len(pattern)j = -1for i in range(ss_len):while j > -1 and pattern[j+1] != ss[i]:j = pos[j]if pattern[j+1] == ss[i]:j = j + 1if j == pattern_len-1:print 'matched @: %s' % str(i-pattern_len+1)j = pos[j]kmp(u'上海自来水来自海上海', u'上海')

希望本文所述对大家的Python程序设计有所帮助。