Basta usar o comando sudo para instalar seu módulo python em /usr/local
:
sudo pip install textstat
[sudo] password for sylvain:
Downloading/unpacking textstat
Downloading textstat-0.1.6.tar.gz
Running setup.py (path:/tmp/pip_build_root/textstat/setup.py) egg_info for package textstat
Installing collected packages: textstat
Running setup.py install for textstat
Successfully installed textstat
Cleaning up...