Python无法在Linux上通过pip查找已安装的软件包

Question

I've been trying to install some new python packages with pip, but for some reason, python is not finding them after installation. This started when I purged my whole install of python, and reinstalled it using apt-get. I installed:

python
python2.7
python2.7-dev
python-setuptools

When I run:

sudo pip list

I get:

decorator (3.4.0)
flann (1.8.4)
ipython (3.2.0)
itsdangerous (0.24)
MarkupSafe (0.23)
numpy (1.9.2)
pexpect (3.1)
pip (7.1.0)
setuptools (18.0.1)
simplegeneric (0.8.1)
Werkzeug (0.10.4)

so numpy is listed as installed. In addition, a

locate numpy

returns

/usr/bin/dh_numpy
/usr/include/numpy
/usr/include/python2.7/numpy
/usr/lib/python2.7/dist-packages/numpy
/usr/lib/python2.7/dist-packages/IPython/external/decorators/_numpy_testing_noseclasses.py
/usr/lib/python2.7/dist-packages/IPython/external/decorators/_numpy_testing_noseclasses.pyc
/usr/lib/python2.7/dist-packages/IPython/external/decorators/_numpy_testing_utils.py
/usr/lib/python2.7/dist-packages/IPython/external/decorators/_numpy_testing_utils.pyc
/usr/local/lib/python2.7/dist-packages/numpy
/usr/local/lib/python2.7/dist-packages/numpy-1.9.2.egg-info
/usr/share/numpy
/usr/share/doc/python-numpy
/usr/share/man/man1/dh_numpy.1.gz
/var/lib/dpkg/info/python-numpy.list
/var/lib/dpkg/info/python-numpy.md5sums
/var/lib/dpkg/info/python-numpy.postinst
/var/lib/dpkg/info/python-numpy.preinst
/var/lib/dpkg/info/python-numpy.prerm

so it seems like the installation is alright. But if I try to import it from python, I get an import error. I've tried many things, like purging the entire python installation, purging pip, easy_install and reinstalling all that, massing with the PYTHONPATH and PYTHONHOME variables, and so forth. For reference, echoing the variables PYTHONPATH returns empty and PYTHONHOME returns:

/usr

In addition, the sys.path variable contains:

['',
 '/usr/local/bin',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-x86_64-linux-gnu',
 '/usr/lib/python2.7/lib-tk',
 '/usr/lib/python2.7/lib-old',
 '/usr/lib/python2.7/lib-dynload',
 '/usr/local/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages/IPython/extensions']

So it is looking in both the /usr/lib/python2.7 directories and in /usr/local/lib/python2.7. Given this question:

Python packages not available after install with pip

I suspect this has something to do with the installation of python that pip is serving. But I only have python in /usr/bin, and not in /usr/local/bin, so I have no idea why pip is installing in local. Plus, as the sys.path variable shows, python should be looking into /usar/local/python2.7 as well. Other packages such as flask, bitarray, and redis have this problem as well. Thank you for the help!

EDIT:

Another important information to add: which -a python outputs /usr/bin/python , so the python being used is in /usr/bin.

Answer 1

if you had previously another python installation, I suspect pip is still associated with the old version. type $ pip -V if it's not 2.7 create a symlink for /Library/Frameworks/Python.framework/Versions/2.7/bin/pip2.7 to usr/bin/pip I see that the packages are installed in the right place so maybe you can try $ python -V as well ps: This should go as a comment but I don't have enough "reputations" to add a comment.