Ansible and docker-compose pull / up -d - docker-compose

Question

I'm trying to run theses commands :
docker-compose pull
docker-compose up -d
docker-compose -f other_file.yaml pull
docker-compose -f other_file.yaml up -d
Here's my Ansible code for this specific task :
- name: Run docker-compose
docker_compose:
project_src: {{ my_project_path }}
files:
- docker-compose.yaml
- other_file.yaml
I'm getting the error bellow
Failed to import the required Python library (Docker SDK for Python: docker (Python >= 2.7) or docker-py (Python 2.6)) on managed's Python /usr/bin/python3.
Please read module documentation and install in the appropriate location.
If the required library is installed, but Ansible is using the wrong Python interpreter, please consult the documentation on ansible_python_interpreter, for example via `pip install docker` or `pip install docker-py` (Python 2.6).
The error was: No module named 'docker'
The fact is that the python interpreter is set up in the ansible.cfg as /usr/bin/python3 which is the good one.
The version of python3 installed is 3.6.9 and the python module "docker" is installed.
Any idea on where this error comes from ? Been reading documentation, and others post all day.
Thanks !

Answer 1

Finally understood why the problem occured.
I was installing the python library with pip3 install <lib> the fact is that it will not work if you're using sudo to run some modules in Ansible because sudo pip3 is different from pip3 on its own.
So quick solution ? sudo pip3 install docker docker-compose