ModuleNotFoundError: No module named 'google_auth_oauthlib'

I have found the error. When I installed the google-auth-oauthlib module via pip, it was installed as a module in the anaconda3 library. But when I run python from the command line, it uses the version from my system, which doesn't have this module.

I had the same issue. Was resolved by using:

sudo pip install google-auth-oauthlib

the sudo was necessary, not sure why, maybe someone else can eleborate.

If you use conda instead of pip:

conda install google-auth google-auth-oauthlib