# coding: gbk

import random

import string

import re

def numx():

    while 1:

        #t=re.compile(r‘[a-z0-9A-Z]‘)

        n=‘‘.join(random.sample(string.letters+string.digits,4)).strip(‘/n‘).replace(‘,‘,‘,‘)

        print n

        xp=re.compile(‘\w+‘, re.I)

        rxp=xp.findall(n)[0].upper()

        #t1=t.match(n)

        #print n.strip(‘-‘)

        #n.split("[‘,‘]")

        num1=raw_input(‘请输入和上面对应验证：‘)

        print ‘num1=%s, rxp=%s‘ % ( num1.upper(), rxp )

        #if num1.upper() in rxp or num1.lower()in rxp:

        if num1.upper() == rxp:

           print ‘验证码正确‘

           print‘不区分大小写‘

           break

        else:

           print‘验证码不正确‘

           print‘不区分大小写‘

           continue

numx()

py验证大小写