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大家好!自己写过小网页爬虫功能。但是我是多线程的新手，我无法优化它。我的代码是:
alreadySeenURLs = dict() #the dictionary of already seen crawlers
candidates = set() #the set of URL candidates to crawl
def initializeCandidates(url):
#gets page with urllib2
page = getPage(url)
#parses page with BeautifulSoup
parsedPage = getParsedPage(page)
#function which return all links from parsed page as set
initialURLsFromRoot = getLinksFromParsedPage(parsedPage)
return initialURLsFromRoot
def updateCandidates(oldCandidates, newCandidates):
return oldCandidates.union(newCandidates)
candidates = initializeCandidates(rootURL)
for url in candidates:
print len(candidates)
#fingerprint of URL
fp = hashlib.sha1(url).hexdigest()
#checking whether url is in alreadySeenURLs
if fp in alreadySeenURLs:
continue
alreadySeenURLs[fp] = url
#do some processing
print url
page = getPage(url)
parsedPage = getParsedPage(page, fix=True)
newCandidates = getLinksFromParsedPage(parsedPage)
candidates = updateCandidates(candidates, newCandidates)
正如你所看到的，这里它在特定时间从候选人那里获取一个 url。我想让这个脚本多线程化，这样它至少可以从候选人那里获取 N 个 url，然后完成这项工作。谁能指导我？给任何链接或建议？