Dryscrape 会话无法加载任何站点

Question

我在 pythonanywhere.com 安装了 dryscrape。但是会话变量无法加载任何站点，为什么？

import dryscrape
# as in demo: http://dryscrape.readthedocs.io/en/latest/usage.html#first-demonstration
dryscrape.start_xvfb() 

sess = dryscrape.Session()
sess.visit('https://www.pythonanywhere.com/')

结果错误：

sess.visit('https://www.pythonanywhere.com/')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/igorsavinkin/.local/lib/python3.5/site-packages/dryscrape/session.py", line 33, in visit
    return self.driver.visit(self.complete_url(url))
  File "/home/igorsavinkin/.local/lib/python3.5/site-packages/webkit_server.py", line 235, in visit
    self.conn.issue_command("Visit", url)
  File "/home/igorsavinkin/.local/lib/python3.5/site-packages/webkit_server.py", line 520, in issue_command
    return self._read_response()
  File "/home/igorsavinkin/.local/lib/python3.5/site-packages/webkit_server.py", line 530, in _read_response
    raise InvalidResponseError(msg)
webkit_server.InvalidResponseError: {"class":"InvalidResponseError","message":"Unable to load URL: https://www.pythonanywhere.com/ because 
of error loading https://www.pythonanywhere.com/: Unknown error"}

无论我从哪个站点进行会话访问whitelisted，问题都是一样的。

我读过有关 dryscrape 的文章 installation prerequisits:

Before installing dryscrape, you need to install some software it depends on:

Qt, QtWebKit

lxml

pip

xvfb_ (necessary only if no other X server is available)

因此，Qt 和 QtWebKit 都不在 pythoneverywhere 的默认模块中...

我尝试安装时，结果报错（QtWebKit也一样）

$ pip install --user Qt
Collecting Qt
  Could not find a version that satisfies the requirement Qt (from versions: )
No matching distribution found for Qt

dryscrape 安装文件，setup.py:

from distutils.core import setup, Command

setup(name='dryscrape',
      version='0.9.1',
      description='a lightweight Javascript-aware, headless web scraping library for Python',
      author='Niklas Baumstark',
      author_email='niklas.baumstark@gmail.com',
      license='MIT',
      url='https://niklasb.github.com/dryscrape',
      packages=['dryscrape', 'dryscrape.driver'],
      requires=['webkit_server', 'lxml'],
      )

任何帮助都是可观的...

Answer 1

这里是 PythonAnywhere 开发者 -- 不幸的是 dryscrape 依赖于 WebKit，而 WebKit 不适用于我们的虚拟化系统。如果您需要使用可以处理 JavaScript 的浏览器进行网页抓取，您可以使用 selenium 和 Firefox——有 more information on our blog。不过请注意，我们只有 Firefox 版本 17——最近出现的问题与 WebKit 的问题相同。

Dryscrape 会话无法加载任何站点

Dryscrape session can't load any site

python

qt

session

pythonanywhere

dryscrape