Question

我正在阅读编程集体智慧，关于搜索引擎的章节，其中我遇到了以下代码，在实现时，它给了我错误。请帮助。

import urllib2
from BeautifulSoup import *
from urlparse import urljoin

class crawler:
def __init__(self,dbname):
    pass

def __del__(self):
    pass
def dbcommit(self):
    pass

def getentryid(self,table,field,value,createnew=True):
    return None

def addtoindex(self,url,soup):
    print 'Indexing %s' % url

def gettextonly(self,soup):
    return None

def seperatewords(self,text):
    return None

def isindexed(self,url):
    return False

def addlinkref(self,urlFrom,urlTo,linkText):
    pass

def 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,linkTest)
                self.dbcommit()
            pages=newpages


def createindextables(self):
    pass

我收到以下错误：

>>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

Answer 1

NameError：未定义全局名称“linkTest”

您将linkText拼错为linkTest：

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

为什么以下代码段无法成功运行？

1 个答案: