Python实现字符串匹配的KMP算法

#! /usr/bin/python
# coding=utf-8
"""
基于这篇文章的python实现
http://blog.sae.sina.com.cn/archives/307
"""
import unittest
def pmt(s):
  """
  PartialMatchTable
  """
  prefix = [s[:i+1] for i in range(len(s)-1)]
  postfix = [s[i+1:] for i in range(len(s)-1)]
  intersection = list(set(prefix) & set(postfix))
  if intersection:
    return len(intersection[0])
  return 0
def kmp(big,small):
  i = 0
  while i