pyScss安装失败

今天6月8日开始，在尝试与PIP安装pyScss当我看到这个错误：pyScss安装失败

$ pip install "pyScss>=1.1.5" 
Downloading/unpacking pyScss>=1.1.5 
    Downloading pyScss-1.2.0.post3.tar.gz (94kB): 94kB downloaded 
    Running setup.py (path:/private/tmp/venv/build/pyScss/setup.py) egg_info for package pyScss 
    no previously-included directories found matching 'documentation/_build' 
    zip_safe flag not set; analyzing archive contents... 
    six: module references __path__ 

    Installed /private/tmp/venv/build/pyScss/six-1.7.0-py2.7.egg 
    Traceback (most recent call last): 
     File "<string>", line 17, in <module> 
     File "/private/tmp/venv/build/pyScss/setup.py", line 13, in <module> 
     from scss.scss_meta import PROJECT, URL, VERSION, AUTHOR, AUTHOR_EMAIL, LICENSE, DOWNLOAD_URL 
     File "scss/__init__.py", line 69, in <module> 
     from scss.functions import ALL_BUILTINS_LIBRARY 
     File "scss/functions/__init__.py", line 5, in <module> 
     from scss.functions.core import CORE_LIBRARY 
     File "scss/functions/core.py", line 11, in <module> 
     from six.moves import xrange 
     File "/var/folders/v6/mg7h8rjd4bbf51n7dm1j00jc0000gn/T/easy_install-pX0iRW/six-1.7.0/six.py", line 187, in load_module 
     return sys.modules[fullname] 
    AttributeError: 'NoneType' object has no attribute 'modules' 
    Complete output from command python setup.py egg_info: 
    no previously-included directories found matching 'documentation/_build' 

zip_safe flag not set; analyzing archive contents... 

six: module references __path__ 



Installed /private/tmp/venv/build/pyScss/six-1.7.0-py2.7.egg 

Traceback (most recent call last): 

    File "<string>", line 17, in <module> 

    File "/private/tmp/venv/build/pyScss/setup.py", line 13, in <module> 

    from scss.scss_meta import PROJECT, URL, VERSION, AUTHOR, AUTHOR_EMAIL, LICENSE, DOWNLOAD_URL 

    File "scss/__init__.py", line 69, in <module> 

    from scss.functions import ALL_BUILTINS_LIBRARY 

    File "scss/functions/__init__.py", line 5, in <module> 

from scss.functions.core import CORE_LIBRARY 

    File "scss/functions/core.py", line 11, in <module> 

    from six.moves import xrange 

    File "/var/folders/v6/mg7h8rjd4bbf51n7dm1j00jc0000gn/T/easy_install-pX0iRW/six-1.7.0/six.py", line 187, in load_module 

    return sys.modules[fullname] 

AttributeError: 'NoneType' object has no attribute 'modules' 

---------------------------------------- 
Cleaning up...

这似乎是由今天的六1.7.0（同前安装工作释放被触发）。在pyScss安装的setup.py egg_info阶段，似乎使用了6个。触发失败的“私人”六次安装。

注：

在一个单独的PIP命令安装pyScss之前安装6解决了这个，但