Gnuplot is good because, contrary to python, because scripts which I wrote 20 years ago still work. I recently failed to get a python script run after six months. Python is really in a dependecy hell. You need most of the times to get a meta-trans-hyper-programme such as anaconda, which will install almost a full operating system so that you have your python thingy running.
Here you will find some tricks and tips to work with gnuplot