Cleverbot vs. Cleverbot

import urllib2
import md5
#import hashlib
import re

class ServerFullError(Exception):
    pass

ReplyFlagsRE = re.compile('<INPUT NAME=(.+?) TYPE=(.+?) VALUE="(.*?)">', re.IGNORECASE | re.MULTILINE)

class Session:
    keylist=['stimulus','start','sessionid','vText8','vText7','vText6','vText5','vText4','vText3','vText2','icognoid','icognocheck','prevref','emotionaloutput','emotionalhistory','asbotname','ttsvoice','typing','lineref','sub','islearning','cleanslate']
    headers={}
    headers['User-Agent']='Mozilla/5.0 (X11; U; Linux x86_64; it; rv:1.9.1.8) Gecko/20100214 Ubuntu/9.10 (karmic) Firefox/3.5.8'
    headers['Accept']='text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'
    headers['Accept-Language']='it-it,it;q=0.8,en-us;q=0.5,en;q=0.3'
    headers['X-Moz']='prefetch'
    headers['Accept-Charset']='ISO-8859-1,utf-8;q=0.7,*;q=0.7'
    headers['Referer']='http://www.cleverbot.com'
    headers['Cache-Control']='no-cache, no-cache'
    headers['Pragma']='no-cache'

    def __init__(self):
        self.arglist=['','y','','','','','','','','','wsf','','','','','','','','','Say','1','false']
        self.MsgList=[]

    def Send(self):
        data=encode(self.keylist,self.arglist)
        digest_txt=data[9:29]
        hash=md5.new(digest_txt).hexdigest()
        self.arglist[self.keylist.index('icognocheck')]=hash
        data=encode(self.keylist,self.arglist)
        req=urllib2.Request("http://www.cleverbot.com/webservicefrm",data,self.headers)
        f=urllib2.urlopen(req)
        reply=f.read()
        return reply

    def Ask(self,q):
        self.arglist[self.keylist.index('stimulus')]=q
        if self.MsgList: self.arglist[self.keylist.index('lineref')]='!0'+str(len(self.MsgList)/2)
        asw=self.Send()
        if '<meta name="description" content="Jabberwacky server maintenance">' in asw: raise ServerFullError, "The Cleverbot server answered with full load error"
        self.MsgList.append(q)
        answ_dict=GetAnswerArgs(asw)
        for k in self.keylist:
            if k in answ_dict: self.arglist[self.keylist.index(k)]=answ_dict[k]
        self.arglist[self.keylist.index('emotionaloutput')]=''
        reply_i=asw.find('<!-- Begin Response !-->')+25
        reply_s=asw.find('<!-- End Response !-->')-1
        text=asw[reply_i:reply_s]
        self.MsgList.append(text)
        return text

def GetAnswerArgs(text):
    results=ReplyFlagsRE.findall(text)
    list={}
    for r in results: list[r[0]]=r[2]
    return list

def encode(keylist,arglist):
    text=''
    for i in range(len(keylist)):
        k=keylist[i]; v=quote(arglist[i])
        text+='&'+k+'='+v
    text=text[1:]
    return text

always_safe = ('ABCDEFGHIJKLMNOPQRSTUVWXYZ'
               'abcdefghijklmnopqrstuvwxyz'
               '0123456789' '_.-')
def quote(s, safe = '/'):   #quote('abc def') -> 'abc%20def'
    safe += always_safe
    safe_map = {}
    for i in range(256):
        c = chr(i)
        safe_map[c] = (c in safe) and c or  ('%%%02X' % i)
    res = map(safe_map.__getitem__, s)
    return ''.join(res)


cb1 = Session()
cb2 = Session()

begin = cb1.Ask("Hello")
print "- " + begin
it1 = cb2.Ask(begin)
print "- " + it1

while True:
    it2 = cb1.Ask(it1)
    print "- " + it2
    it1 = cb2.Ask(it2)
    print "- " + it1