google-app-engine - Google App Engine Python 2.7 + lxml = Unicode ParserError

Question

我正在尝试使用 BeautifulSoup v4解析文档。我在 note.content 上调用 BeautifulSoup，它是 Evernote 的 API 返回的字符串:

soup = BeautifulSoup(note.content)

我在我的 app.yaml 文件中启用了 lxml:

libraries:
- name: lxml
  version: "2.3"

请注意，这适用于我的本地开发服务器。但是，当部署到 Google 的云时，出现以下错误:

错误跟踪:

Unicode parsing is not supported on this platform
Traceback (most recent call last):
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1511, in __call__
    rv = self.handle_exception(request, response, e)
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1505, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1253, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1077, in __call__
    return handler.dispatch()
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 547, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 545, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~ever-blog/1.356951374446096208/controller/blog.py", line 101, in get
    soup = BeautifulSoup(note.content)
  File "/base/data/home/apps/s~ever-blog/1.356951374446096208/lib/bs4/__init__.py", line 168, in __init__
    self._feed()
  File "/base/data/home/apps/s~ever-blog/1.356951374446096208/lib/bs4/__init__.py", line 181, in _feed
    self.builder.feed(self.markup)
  File "/base/data/home/apps/s~ever-blog/1.356951374446096208/lib/bs4/builder/_lxml.py", line 62, in feed
    self.parser.feed(markup)
  File "parser.pxi", line 1077, in lxml.etree._FeedParser.feed (third_party/apphosting/python/lxml/src/lxml/lxml.etree.c:76196)
ParserError: Unicode parsing is not supported on this platform

更新:

我检查了 parser.pxi，我发现了这些产生错误的代码行:

elif python.PyUnicode_Check(data):
            if _UNICODE_ENCODING is NULL:
                raise ParserError, \
                    u"Unicode parsing is not supported on this platform"

我认为一定是 GAE 的部署环境导致了这个错误，但我不确定是什么原因。

更新 2:

因为 BeautifulSoup 会自动回退到其他解析器，所以我最终从我的应用程序中完全删除了 lxml。这样做解决了问题。

Answer 1

尝试解析 utf-8 字符串而不是 unicode。