点不显示我已安装的软件包

Question

pip won't show my installed packages.

I did

brew install python
sudo -E pip install virtualenv
pip list

pip (1.5.6)
setuptools (5.4.2)
wsgiref (0.1.2)

Why isn't pip showing virtualenv ?

This pip is the version installed by brew.

When I installed python, it says:

They will install into the site-package directory /usr/local/lib/python2.7/site-packages

Looking in this directory, virtualenv is not there.

Doing an updatedb; locate virtualenv, I find it installed here:

/lib/python2.7/site-packages/

What gives? Pip installs to above location, but isn't aware of it when I do pip list !

EDIT: In response to @jordanm's comment,

sudo -E pip install virtualenv

Password:
Downloading/unpacking virtualenv
  Downloading virtualenv-1.11.6-py2.py3-none-any.whl (1.6MB): 1.6MB downloaded
Installing collected packages: virtualenv
Successfully installed virtualenv
Cleaning up...

Answer 1

sudo -E pip install virtualenv most likely installs virtualenv to OSX provided system-wide Python installation, not Homebrew installed Python.

Try:

  brew install pyenv-virtualenv

instead.