You can run build.sh directly, or use Docker like this:
docker build --tag python_builder .
docker run --rm --interactive --tty --name python_builder python_builder
# run inside the docker container:
./build.sh
# run this from a another terminal while the container is still running:
docker cp python_builder:/Python-3.7.2/python3.7_3.7.2-1_amd64.deb .
# install the package
sudo dpkg -i python3.7_3.7.2-1_amd64.deb
You should check whether a newer version of Python is available and modify the
build.sh
accordingly. The commands above will also have to be modified.