From the exercise itself: "Finally, use each of these in a small Python program, or as many as you can get done. The key here is to find out what the symbol does, make sure you got it right, correct it if you do not, then use it to lock it in."
The conclusion in the article: "For me, the easiest and most pragmatic way to learn Python is not by reading through pages of reference documentation and syntax, but to just start coding."
Isn't that the entire point of "The Hard way" approach - don't just read, but start writing code to figure things out.
"What's also important is to find out what you do not know so you can fix it later."