ValueError:urllib2中未知的URL类型，但是如果在浏览器中打开该URL则可以 [英] ValueError: unknown url type in urllib2, though the url is fine if opened in a browser

问题描述

基本上，我正在尝试在python中使用urllib2下载URL.

Basically, I am trying to download a URL using urllib2 in python.

代码如下:

import urllib2
req = urllib2.Request('www.tattoo-cover.co.uk')
req.add_header('User-agent','Mozilla/5.0')
result = urllib2.urlopen(req)

它输出ValueError，程序在示例中为URL压缩. 当我在浏览器中访问该URL时，效果很好.

it outputs ValueError and the program crushes for the URL in the example. When I access the url in a browser, it works fine.

有什么想法可以解决这个问题吗?

Any ideas how to handle the problem?

更新:

感谢Ben James并发现了问题=>添加'http://'

thanks for Ben James and sth the problem is detected => add 'http://'

现在，问题已得到完善: 是否可以通过某些内置函数自动处理这种情况?或者我必须在后续的字符串连接中进行错误处理?

Now the question is refined: Is it possible to handle such cases automatically with some builtin function or I have to do error handling with subsequent string concatenation?

推荐答案

在没有协议的浏览器中输入URL时，默认为HTTP. urllib2不会为您做这个假设；您需要在其前面加上http://.

When you enter a URL in a browser without the protocol, it defaults to HTTP. urllib2 won't make that assumption for you; you need to prefix it with http://.

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