Python urllib2 HTTPBasicAuthHandler [英] Python urllib2 HTTPBasicAuthHandler

问题描述

代码如下:

import urllib2 as URL

def get_unread_msgs(user, passwd):
    auth = URL.HTTPBasicAuthHandler()
    auth.add_password(
            realm='New mail feed',
            uri='https://mail.google.com',
            user='%s'%user,
            passwd=passwd
            )
    opener = URL.build_opener(auth)
    URL.install_opener(opener)
    try:
        feed= URL.urlopen('https://mail.google.com/mail/feed/atom')
        return feed.read()
    except:
        return None

它工作得很好.唯一的问题是，当使用了错误的用户名或密码时，需要永远打开到 url @

It works just fine. The only problem is that when a wrong username or password is used, it takes forever to open to url @

feed= URL.urlopen('https://mail.google.com/mail/feed/atom')

它不会抛出任何错误，只是永远执行 urlopen 语句.

It doesn't throw up any errors, just keep executing the urlopen statement forever.

我如何知道用户名/密码是否不正确.

How can i know if username/password is incorrect.

我想到了该功能的超时，但随后会将所有错误甚至慢速互联网变成身份验证错误.

I thought of a timeout for the function but then that would turn all error and even slow internet into a authentication error.

推荐答案

它应该抛出一个错误，更准确地说是一个 urllib2.HTTPError，代码字段设置为 401，您可以在下面看到一些改编的代码.我留下了你的通用 try/except 结构，但实际上，不要使用通用的 except 语句，只捕捉你期望可能发生的事情！

It should throw an error, more precisely an urllib2.HTTPError, with the code field set to 401, you can see some adapted code below. I left your general try/except structure, but really, do not use general except statements, catch only what you expect that could happen!

def get_unread_msgs(user, passwd):
    auth = URL.HTTPBasicAuthHandler()
    auth.add_password(
            realm='New mail feed',
            uri='https://mail.google.com',
            user='%s'%user,
            passwd=passwd
            )
    opener = URL.build_opener(auth)
    URL.install_opener(opener)
    try:
        feed= URL.urlopen('https://mail.google.com/mail/feed/atom')
        return feed.read()
    except HTTPError, e:
        if e.code == 401:
            print "authorization failed"            
        else:
            raise e # or do something else
    except: #A general except clause is discouraged, I let it in because you had it already
        return None

我刚刚在这里测试过，效果很好

I just tested it here, works perfectly

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