python单线程爬虫code

# -*- coding: utf-8 -*- 
import urllib
 urllib.request
from bs4  BeautifulSoup
 threading
mylock = threading.RLock()
class Crawler:
    unVisitUrl = set()
    visitedUrl = []
    def getHtml(self,url):

        html = ''
        req = urllib.request.Request(url,headers = {
            'Connection': Keep-Alive',Accepttext/html,application/xhtml+xml,*/*Accept-Languageen-US,en;q=0.8,zh-Hans-CN;q=0.5,zh-Hans;q=0.3User-AgentMozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko
        })
        try:
            respose = urllib.request.urlopen(req,timeout = 10)
            html = respose.read().decode(UTF-8').replace(&nbsp',)
        except Exception as e:
            pass

        return html;

     getUrlFromHtml(self,html,sitePath):

        if(html):
            soup = BeautifulSoup(html,1)">html.parser)
            aList = soup.find_all(a)
            for a in aList:
                :
                    if sitePath in a[href'] and a['].startswith(http://):
                        self.addUnVisitUrl(a[])
                        self.addVisitedUrl(a[])
                 KeyError:
                    pass

     解析网页内容
     analysis(self,url,sitePath):

        self.initUnVisitUrl(url)

        while(len(self.unVisitUrl) > 0):
            visitingUrl = self.getUnVisitUrl()
            print(visitingUrl)
            (visitingUrl):
                html = self.getHtml(visitingUrl)
                (html):
                     获取网页中所有内部链接，存储
                    self.getUrlFromHtml(html,sitePath)

     初始化根链接
     initUnVisitUrl(self,url):
        self.unVisitUrl.add(url)

     addUnVisitUrl(self,url):
        if url not in self.unVisitUrl and url  self.visitedUrl:
            self.unVisitUrl.add(url)

     getUnVisitUrl(self):

        url = None
        unVisitUrlTmp = list(self.unVisitUrl)
         unVisitUrlTmp[0]:
            url = unVisitUrlTmp[0]
            self.unVisitUrl.remove(url)

         url

     addVisitedUrl(self,url):
        self.visitedUrl.append(url)