How to force yaourt to install all updates

I'm trying to update my system via yaourt, but I'm getting an error due to a python package installed with pip instead of yaourt.

I'm not succeeding in forcing yaourt to install the update, and I'd like to avoid to remove the package with pip and reinstall it with yaourt.

These are the commands I tried :

This is the output I get all the times :

How can I force yaourt to update the all packages?