将 url 与单词列表中的单词组合时出现 URLOpen 错误

Question

大家好，我正在制作 Python 网络爬虫。所以我有一个 link，最后一个字符是："search?q=" 然后我使用我之前加载到列表中的单词列表。但是当我尝试打开它时： urllib2.urlopen(url) 它抛出一个错误 (urlopen error no host given) 。但是当我正常打开 link 和 urllib 时（所以输入通常自动粘贴的单词）它工作正常。那么你能告诉我为什么会这样吗？

感谢和问候

完整错误：

  File "C:/Users/David/PycharmProjects/GetAppResults/main.py", line 61, in <module>
    getResults()
  File "C:/Users/David/PycharmProjects/GetAppResults/main.py", line 40, in getResults
    usock = urllib2.urlopen(url)
  File "C:\Python27\lib\urllib2.py", line 127, in urlopen
    return _opener.open(url, data, timeout)
  File "C:\Python27\lib\urllib2.py", line 402, in open
    req = meth(req)
  File "C:\Python27\lib\urllib2.py", line 1113, in do_request_
    raise URLError('no host given')
urllib2.URLError: <urlopen error no host given>

代码：

with open(filePath, "r") as ins:
    wordList = []
    for line in ins:
        wordList.append(line)

def getResults():
packageID = ""
count = 0
word = "Test"
for x in wordList:
    word = x;
    print word
    url = 'http://www.example.com/search?q=' + word
    usock = urllib2.urlopen(url)
    page_source = usock.read()
    usock.close()
    print page_source
    startSequence = "data-docid=\""
    endSequence = "\""
    while page_source.find(startSequence) != -1:
        start = page_source.find(startSequence) + len(startSequence)
        end = page_source.find(endSequence, start)
        print str(start);
        print str(end);
        link = page_source[start:end]
        print link
        if link:
            if not link in packageID:
                packageID += link + "\r\n"
                print packageID
        page_source = page_source[end + len(endSequence):]
count+=1

所以当我打印字符串单词时，它会从单词列表中输出正确的单词

Answer 1

Note that urlopen() returns a response, not a request.

您的代理配置可能已损坏；验证您的代理是否正常工作：

print(urllib.request.getproxies())

或完全绕过代理支持：

url = urllib.request.urlopen(
    "http://www.example.com/search?q="+text_to_check
    proxies={})

将 URL 与 Wordlist 中的单词组合的示例方法。它结合列表词从 url 中获取图像并下载它。循环它以访问您拥有的整个列表。

import urllib
import re
print "The URL crawler starts.."

mylist =["http://www.ebay","https://www.npmjs.org/"]
wordlist = [".com","asss"]

x = 1
urlcontent = urllib.urlopen(mylist[0]+wordlist[0]).read()
imgUrls = re.findall('img .*?src="(.*?)"',urlcontent)

for imgUrl in imgUrls:
    img = imgUrl
    print img
    urllib.urlretrieve(img,str(x)+".jpg")
    x= x + 1

希望这对您有所帮助，否则 post 您的代码和错误日志。

Answer 2

我解决了问题。我现在只是使用 urrlib 而不是 urllib2，一切正常谢谢大家:)

将 url 与单词列表中的单词组合时出现 URLOpen 错误

URLOpen Error while combining url with word from wordlist

python

host

urllib