psutil failed import

[giusepp...@unical.it]

Hi I am a newbie at this stuff, I am trying to run a script 

https://github.com/alviano/python/tree/master/pyrunlim

importing psutil, but the import fails

Traceback (most recent call last):

  File "./pyrunlim.py", line 24, in <module>

    import psutil

The library seems to be installed, I don't know whether I have to check further parameters

pip install psutil

Requirement already satisfied: psutil in /usr/local/lib/python2.7/dist-packages (5.4.6)

I also did a recursive chmod a+rw to /usr/local/lib/python2.7/dist-packages/psutil directory, but the script still fails the import.

Anybody can help?

Thanks

G.