Even knowing a lot about FP, I still found this worth skimming for the esoteric Python syntax. When it comes to constructing dictionaries with list comprehensions, I would always do something like this:

  dict([n, 2 ** n] for n in range(5))

But they pointed out an actual "dict comprehension" that I didn't even realize existed:

  { n: n ** 2 for n in range(5) }

And there is a similar "set comprehension":

  { n ** 2 for n in range(5) }

Always amazes me how you can use Python for so many years and still encounter new features in the language.