You can use our docker image with the following command:
$ docker run -e PYTHONPATH=/usr/lib/python3.8/site-packages:/packages/python/lib/python3.8/site-packages \
-v /my-packages-folder:/packages \
-a STDIN -a STDOUT -a STDERR -i --rm \
moderncloud/python-language-server:0.2 \
python3 /startserver.py