Making Matplotlib in Docker draws in Windows through WSL

The initial title of this post is "A Simple Docker Example", which is going to show how to plot a simple Python program into a Docker image and run it. But it turns out that I’ve chosen a not so simple one as an example. Few days ago, I have annotated several hundred of bib images with their corresponding bib numbers for my Bib-Racer-Recognition project. I want to double check whether I have tagged the bib numbers correctly for the images, so I just created a simple program to show the original images and the corresponding bib numbers.