/usr/bin/python
is the executable for the python that comes with OS X. /usr/local/lib
is a location for user-installed programs only, possibly from Python.org or Homebrew. So you’re mixing different Python installs, and changing the python path is only a partial workaround for different packages being installed for different installations.
In order to make sure you use the pip
associated with a particular python, you can run python -m pip install <pkg>
, or go look at what the pip
on your path is, or is symlinked to.