我试图运行我在网上找到的http://www.netinstructions.com/how-to-make-a-web-crawler-in-under-50-lines-of-python-code/Python的网络爬虫(NameError:名字“蜘蛛”没有定义)
然而,通过Python的3.5运行时,我遇到问题的例子。 2壳牌。
spider("http://www.dreamhost.com", "secure", 200)
给我的留言:
回溯(最近通话最后一个): 文件 “”,1号线,在 蜘蛛( “http://www.dreamhost.com”, “安全”,200) NameError:名字 '蜘蛛'没有定义
from html.parser import HTMLParser
from urllib.request import urlopen
from urllib import parse
class LinkParser(HTMLParser):
def handle_starttag(self, tag, attrs):
if tag == 'a':
for (key, value) in attrs:
if key == 'href':
newUrl = parse.urljoin(self.baseUrl, value)
self.links = self.links + [newUrl]
def getLinks(self, url):
self.links = []
self.baseUrl = url
response = urlopen(url)
if response.getheader('Content-Type')=='text/html':
htmlBytes = response.read()
htmlString = htmlBytes.decode("utf-8")
self.feed(htmlString)
return htmlString, self.links
else:
return "",[]
def spider(url, word, maxPages):
pagesToVisit = [url]
numberVisited = 0
foundWord = False
while numberVisited < maxPages and pagesToVisit != [] and not foundWord:
numberVisited = numberVisited +1
url = pagesToVisit[0]
pagesToVisit = pagesToVisit[1:]
try:
print(numberVisited, "Visiting:", url)
parser = LinkParser()
data, links = parser.getLinks(url)
if data.find(word)>-1:
foundWord = True
pagesToVisit = pagesToVisit + links
print(" **Success!**")
except:
print(" **Failed!**")
if foundWord:
print("The word", word, "was found at", url)
else:
print("Word never found")
你如何运行它?您在REPL中输入的所有说明是什么? –