I want to find out where the Python package is installed

Write python-msite --user-site in the command line Outputs the absolute path.

In the site module, site.getsitepackages() return a list with the global site-package directory as its element.

import site; 
print site.getsitepackages()

Result: ['/System/Library/Frameworks/Python.framework/Version/2.7/Extras/lib/python', '/Library/Python/2.7/site-packages']