This comment made me laugh so hard I got some weird looks from the person in the cube next to me.
On a more serious note, if you had never used a concrete trowel before and you weren't totally sure what it was, using it to make waffle batter would give you a better understanding of what it was and what it is good for.
A bit of an overreaction don't you think? Especially after the OP explained that he is using docker for educational purposes and even included instructions for pure python. Seems unnecessary to continue ragging on him.
Using Docker to run a tool intended for home-use (i.e. not on a server) for 'educational purposes' is like learning to shave your bikini line by cutting the neighbourhood hedges.
Not only 'learning Docker' is a pretty solid reason, it's not even that bad an idea. I have spun up containers for simpler stuff, like when I couldn't install a certain library because Anaconda messed up the install of a dependency which depended on native code.
I would say the risk reward on these two are a little bit different. With using Docker on something you are just trying out you risk wasting some time and maybe some abuse from stephenr on hackernews.
Practicing shaving your bikini line with hedgeclippers you stand to lose... well a lot more.
On a more serious note, if you had never used a concrete trowel before and you weren't totally sure what it was, using it to make waffle batter would give you a better understanding of what it was and what it is good for.