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我正在使用全新的Python virtualenv。我刚刚使用pip安装了，但Python无法看到它。Python无法看到用pip安装的模块
(venv)$ sudo pip install httplib2
Requirement already satisfied (use --upgrade to upgrade): httplib2 in
/usr/local/lib/python2.7/dist-packages
Cleaning up...
(venv)$ python
Python 2.7.3 (default, Sep 26 2013, 20:03:06)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import httplib2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named httplib2
从我的阅读，这听起来像这可能是一个路径问题，但我不知道为什么它正在发生，或如何解决它:(
这是sys.path内容：
>>> pprint(sys.path)
['',
'/var/apps/ttex/venv/local/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg',
'/var/apps/ttex/venv/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg',
'/var/apps/ttex/venv/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg',
'/var/apps/ttex/venv/lib/python2.7/site-packages/pip-1.1-py2.7.egg',
'/var/apps/ttex/venv/lib/python2.7',
'/var/apps/ttex/venv/lib/python2.7/plat-linux2',
'/var/apps/ttex/venv/lib/python2.7/lib-tk',
'/var/apps/ttex/venv/lib/python2.7/lib-old',
'/var/apps/ttex/venv/lib/python2.7/lib-dynload',
'/usr/lib/python2.7',
'/usr/lib/python2.7/plat-linux2',
'/usr/lib/python2.7/lib-tk',
'/var/apps/ttex/venv/local/lib/python2.7/site-packages',
'/var/apps/ttex/venv/lib/python2.7/site-packages']
奇怪的是，虽然，如果我运行Python 2.7，我可以看到包：
(venv)$ python2.7
>>> import httplib2
>>>
为什么会发生这种情况，我该怎么办？
对不起，如果这是重复的，围绕这个话题有很多问题，但没有一个似乎给出了一个简单明确的答案。