container db:
docker run --name=api_blacklists_db --env=MYSQL_DATABASE=db_api --env=MYSQL_USER=user_api --env=MYSQL_PASSWORD=api_test --env=MYSQL_ROOT_PASSWORD=test --env=MYSQL_HOST=db --publish=3306:3306 --volume=/home/snake/Downloads/api_blacklists/dump:/docker-entrypoint-initdb.d  mariadb


container python
docker run --name=api_blacklists_python_script --env=SET_CONTAINER_TIMEZONE=true --env=CONTAINER_TIMEZONE=America/Santiago --link=api_blacklists_db --volume=/home/snake/Downloads/docker_python/code:/code python-script-imagen python -u ip_blacklist.py

ERROR :
2005, "Unknown MySQL server host 'db' (0)")