我在阅读《编程集体智慧》一书，关于搜索引擎的那一章时，遇到了以下代码片段，并在实现时遇到了错误。请帮助我解决这个问题。

import urllib2from BeautifulSoup import *from urlparse import urljoinclass crawler:def __init__(self,dbname):    passdef __del__(self):    passdef dbcommit(self):    passdef getentryid(self,table,field,value,createnew=True):    return Nonedef addtoindex(self,url,soup):    print 'Indexing %s' % urldef gettextonly(self,soup):    return Nonedef seperatewords(self,text):    return Nonedef isindexed(self,url):    return Falsedef addlinkref(self,urlFrom,urlTo,linkText):    passdef crawl(self,pages,depth=2):    for i in range(depth):        newpages=set()        for page in pages:            try:                c=urllib2.urlopen(page)            except:                print 'Could not open %s'%page                continue            soup=BeautifulSoup(c.read())            self.addtoindex(page,soup)            links=soup('a')            for link in links:                if('href' in dict(link.attrs)):                    url=urljoin(page,link['href'])                    if url.find("'")!=-1: continue                    url=url.split('#')[0]                    if url[0:4]=='http' and not self.isindexed(url):                        newpages.add(url)                    linkText=self.gettextonly(link)                    self.addlinkref(page,url,linkText)                self.dbcommit()            pages=newpagesdef createindextables(self):    pass

我得到了以下错误：

>>cwlr.crawl(pagelist)Indexing http://en.wikipedia.org/wiki/Artificial_neural_network---------------------------------------------------------------------------NameError                                 Traceback (most recent call last)<ipython-input-50-97778b0c0db8> in <module>()----> 1 cwlr.crawl(pagelist)C:\Users\Blue\Anaconda\searchengine.py in crawl(self, pages, depth)     47                                                 url=urljoin(page,link['href'])     48                                                 if url.find("'")!=-1: continue---> 49                                                 url=url.split('#')[0]     50                                                 if url[0:4]=='http' and not      self.isindexed(url): 51                                                         newpages.add(url)NameError: global name 'linkTest' is not defined

回答：

NameError: global name ‘linkTest’ is not defined

您将linkText拼写错误为linkTest：

linkText=self.gettextonly(link)      ↑self.addlinkref(page,url,linkTest)                               ↑