BeautifulSoup4 在 Sagemath 中

Question

我正在尝试使用 BS4 执行网页抓取，然后在 Sage 6.2（在 Lion 10.7.5 中）中对结果进行一些代数运算。我假设 /Applications/Sage-6.2.app/Contents/Resources/sage/sage -i beautifulsoup4 会起作用，但结果是

Attempting to download package beautifulsoup4
>>> Checking online list of optional packages.
[Traceback (most recent call last):
  File "<stdin>", line 35, in <module>
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python/urllib.py", line 240, in retrieve
    fp = self.open(url, data)
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python/urllib.py", line 208, in open
    return getattr(self, name)(url)
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python/urllib.py", line 359, in open_http
    return self.http_error(url, fp, errcode, errmsg, headers)
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python/urllib.py", line 376, in http_error
    return self.http_error_default(url, fp, errcode, errmsg, headers)
  File "<stdin>", line 17, in http_error_default
IOError: [Errno 404] Not Found: '//www.sagemath.org/spkg/optional/list'
Error: failed to download http://www.sagemath.org/spkg/optional/list, aborting

接下来，我尝试 /Applications/Sage-6.2.app/Contents/Resources/sage/sage -sh <<< "easy_install --verbose pip" 通过 pip 获取 bs4。成功了；但是 /Applications/Sage-6.2.app/Contents/Resources/sage/local/bin/pip2.7 install beautifulsoup4 失败并显示错误消息

Traceback (most recent call last):
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/site.py", line 548, in <module>
    main()
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/site.py", line 530, in main
    known_paths = addusersitepackages(known_paths)
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/site.py", line 266, in addusersitepackages
    user_site = getusersitepackages()
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/site.py", line 241, in getusersitepackages
    user_base = getuserbase() # this will also set USER_BASE
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/site.py", line 231, in getuserbase
    USER_BASE = get_config_var('userbase')
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/sysconfig.py", line 516, in get_config_var
    return get_config_vars().get(name)
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/sysconfig.py", line 449, in get_config_vars
    import re
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/re.py", line 105, in <module>
    import sre_compile
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/sre_compile.py", line 14, in <module>
    import sre_parse
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/sre_parse.py", line 17, in <module>
    from sre_constants import *
  File "/Applications/Sage-6.2.app/Contents/Resources/sage/local/lib/python2.7/sre_constants.py", line 18, in <module>
    from _sre import MAXREPEAT
ImportError: cannot import name MAXREPEAT

接下来，我尝试升级到 Sage 6.6。一切顺利，bs4 的安装也是如此。但是，当我打开笔记本时，我无法对单元格进行运行编码，因为 "Shift-Enter" 命令仅注册为 "Enter" 并给了我一个新行而不是评估代码。此外，没有 "evaluate" 按钮。任何解决这些问题的建议都将不胜感激。

Answer 1

不幸的是，Sage 已经改变了它处理 BS 等可选包的方式，因此旧版本可能无法使用它们。不过，你总是可以去镜像，比如 http://mirrors.mit.edu/sage/spkg/optional/ 下载它，并将它放在你的（旧 Sage 的）可选 spkg 目录中，然后尝试 sage -i path/to/file.

至于笔记本问题，由于 jQuery 版本不同，这应该是在浏览器中执行 "hard cache reset" 的问题，参见例如here.

BeautifulSoup4 在 Sagemath 中

BeautifulSoup4 in Sagemath

python

beautifulsoup

pip

sage