破解栅栏密码python脚本

今天遇到一个要破解的栅栏密码，写了个通用的脚本

#!/usr/bin/env python
# -*- coding: gbk -*-
# -*- coding: utf_8 -*-
# Author: 蔚蓝行
# http://www.cnblogs.com/duanv
e = raw_input('请输入要解密的字符串\n')
elen = len(e)
field=[]
for i in range(2,elen):
            if(elen%i==0):
                field.append(i)

for f in field:
    b = elen / f
    result = {x:'' for x in range(b)}
    for i in range(elen):
        a = i % b;
        result.update({a:result[a] + e[i]})
    d = ''
    for i in range(b):
        d = d + result[i]
    print '分为\t'+str(f)+'\t'+'栏时，解密结果为：  '+d