XML解析器语法错误

Question

所以我正在处理一个与Flickr API通信的代码块.

我在xml.parsers.expat.ExpatError(下面)中遇到了"语法错误" .现在我无法弄清楚它是如何在Python模块中出现语法错误的.

我在SO上看到了关于维基百科API的另一个类似问题,它似乎返回了HTML的XML内容.Flickr API返回XML; 当Flickr没有响应时我也会得到同样的错误(例如flickr.galleries.addPhoto)

码:

def _dopost(method, auth=False, **params):
    #uncomment to check you aren't killing the flickr server
    #print "***** do post %s" % method

    params = _prepare_params(params)
    url = '%s%s/%s' % (HOST, API, _get_auth_url_suffix(method, auth, params))
    payload = 'api_key=%s&method=%s&%s'% \
          (API_KEY, method, urlencode(params))

    #another useful debug print statement
    #print url
    #print payload

    return _get_data(minidom.parse(urlopen(url, payload)))

追溯:

Traceback (most recent call last):
  File "TESTING.py", line 30, in <module>
    flickr.galleries_create('test_title', 'test_descriptionn goes here.')
  File "/home/vlad/Documents/Computers/Programming/LEARNING/curatr/flickr.py", line 1006, in galleries_create
    primary_photo_id=primary_photo_id)
  File "/home/vlad/Documents/Computers/Programming/LEARNING/curatr/flickr.py", line 1066, in _dopost
    return _get_data(minidom.parse(urlopen(url, payload)))
  File "/usr/lib/python2.6/xml/dom/minidom.py", line 1918, in parse
    return expatbuilder.parse(file)
  File "/usr/lib/python2.6/xml/dom/expatbuilder.py", line 928, in parse
    result = builder.parseFile(file)
  File "/usr/lib/python2.6/xml/dom/expatbuilder.py", line 207, in parseFile
    parser.Parse(buffer, 0)
xml.parsers.expat.ExpatError: syntax error: line 1, column 62

(新BSD许可下的http://code.google.com/p/flickrpy/代码)

更新:

print urlopen(url, payload) == <addinfourl at 43340936 whose fp = <socket._fileobject object at 0x29400d0>>

做一个urlopen(url, payload).read()返回终端难以阅读的HTML:P但是我设法做出了"你还没有登录".
奇怪的是,Flickr不应该在这里返回任何内容,或者如果权限是一个问题,它应该返回一个99: User not logged in / Insufficient permissions错误,就像它对GET函数(我期望它将在有效的XML中)一样.

我已登录到Flickr(在浏览器中)并且该程序已通过delete权限进行了适当的身份验证(危险,但我想避免权限问题.)

Answer 1

SyntaxError通常意味着Python语法中的错误,但我认为expatbuilder在重载它意味着XML语法错误.try:except在它周围放一块,打印出来的内容payload并找出它的第一行有什么问题.

我的猜测是,flickr因某种原因拒绝了您的请求并返回了纯文本错误消息,该消息在第62列有一个无效的xml字符,但它可以是任意数量的东西.您可能希望在解析之前检查http状态代码.

此外,调用此方法有点奇怪,_dopost但您似乎实际上正在发送http GET.也许这就是它失败的原因.