A Python wheel distribution of gnuplot - install and use gnuplot directly via pip.
pip install gnuplot-wheelgit clone --recursive https://github.com/shenxianpeng/gnuplot-wheel.git
cd gnuplot-wheel
python3 -m build --wheel
pip install dist/gnuplot-*.whlMIT License. Gnuplot itself has its own license - see gnuplot.info.