MarkupSafe不會安裝在亞馬遜Linux上的virtualenv上

Question

我發現MarkupSafe在主機環境中安裝得很好，但在virtualenv中，pip默默地失敗。

[user@host ~]$ virtualenv testenv 
New python executable in testenv/bin/python2.7 
Also creating executable in testenv/bin/python 
Installing setuptools, pip...done. 
[user@host ~]$ \. testenv/bin/activate 
(testenv)[user@host ~]$ pip install 
You are using pip version 6.0.8, however version 7.1.2 is available. 
You should consider upgrading via the 'pip install --upgrade pip' command. 
You must give at least one requirement to install (see "pip help install") 
(testenv)[user@host ~]$ pip install --upgrade pip 
You are using pip version 6.0.8, however version 7.1.2 is available. 
You should consider upgrading via the 'pip install --upgrade pip' command. 
Collecting pip from https://pypi.python.org/packages/py2.py3/p/pip/pip-7.1.2-py2.py3-none-any.whl#md5=5ff9fec0be479e4e36df467556deed4d 
    Using cached pip-7.1.2-py2.py3-none-any.whl 
Installing collected packages: pip 
    Found existing installation: pip 6.0.8 
    Uninstalling pip-6.0.8: 
     Successfully uninstalled pip-6.0.8 

Successfully installed pip-7.1.2 
(testenv)[user@host ~]$ pip install pip 
Requirement already satisfied (use --upgrade to upgrade): pip in ./testenv/lib/python2.7/dist-packages 
(testenv)[user@host ~]$ pip install markupsafe 
Collecting markupsafe 
    Using cached MarkupSafe-0.23.tar.gz 
Installing collected packages: markupsafe 
    Running setup.py install for markupsafe 
Successfully installed markupsafe 
(testenv)[user@host ~]$ pip install markupsafe 
Collecting markupsafe 
    Using cached MarkupSafe-0.23.tar.gz 
Installing collected packages: markupsafe 
    Running setup.py install for markupsafe 
Successfully installed markupsafe 
(testenv)[user@host ~]$ which python 
~/testenv/bin/python 
(testenv)[user@host ~]$ python 
Python 2.7.10 (default, Dec 8 2015, 18:25:23) 
[GCC 4.8.3 20140911 (Red Hat 4.8.3-9)] on linux2 
Type "help", "copyright", "credits" or "license" for more information. 
>>> import markupsafe 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
ImportError: No module named markupsafe 
>>> 
(testenv)[user@host ~]$ pip freeze 
(testenv)[user@host ~]$ 

不知道下一步是什麼，或者這可能是誰的錯。 我的下一步行動是什麼？

補充說：還記錄針對的virtualenv一個問題：https://github.com/pypa/virtualenv/issues/836

Answer 1

我對亞馬遜的Linux 2015.09相同的問題與扭曲，它安裝，但隨後無法導入zope.interface和twisted.internet模塊。我已經通過升級全系統的virtualenv修好了，跑了作爲根：

yum remove python27-virtualenv 
pip install virtualenv 

並重新創建我的virtualenv。