pip freeze 不显示包

Question

For example if after installing Tornado with pip like this:

pip install tornado
Collecting tornado
...
Successfully installed backports-abc certifi singledispatch six tornado

pip freeze doesn't return tornado package in list, it just shows:

PyMySQL==0.7.2

also when I run easy_install it returns:

error: bad install directory or PYTHONPATH

You are attempting to install a package to a directory that is not
on PYTHONPATH and which Python does not read ".pth" files from.  The
installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:

    /lib/python2.7/site-packages/

and your PYTHONPATH environment variable currently contains:

    ''

What is going wrong?

Answer 1

When using virtualenvwrapper or another virtual environment (which is probably not your case but is how I arrived at this question), you may have installed things using sudo which will install them for your entire system. ( See here )

Therefore, pip freeze actually is working, you just haven't actually installed anything with that pip.

Answer 2

1. I suppose reinstalling pip may help you:

    pip install --upgrade pip

2. To fix easy_install problem add /lib/python2.7/site-packages/ to your PYTHONPATH:

    export PYTHONPATH=$PYTHONPATH:/lib/python2.7/site-packages/

Good Luck !

Answer 3

upgrade pip and it will work. I had the exact same problem. In my case it wasn't " sudo " related, but upgrading pip via pip install --upgrade pip solved the issue.