[Python] pip che non disinstalla ne aggiorna un pacchetto

[orsomannaro]

Qualcuno sa spiegarmi questo:

$ pip search reportlab
reportlab                 - The Reportlab Toolkit
   INSTALLED: 2.5
   LATEST:    2.6

$ sudo pip install --upgrade reportlab
Requirement already up-to-date: reportlab in 
/usr/lib/python2.7/dist-packages
Cleaning up...

$ sudo pip uninstall reportlab
Can't uninstall 'reportlab'. No files were found to uninstall.

$ pip freeze | grep reportlab
reportlab==2.5