A great example of the Blub paradox in action ;)
Oh wait. Nobody says that about Haskell programmers? They only say it about Python? Huh. When they both have this same shortcoming with their so-called "closures"? Wonder why that is?
Anyone who's reached that point with Python is very comfortable with the idea of mutable state... everywhere else.
But a Haskell programmer who understands this and decides to accept it is just considered normal. A Python programmer who understands this and decides to accept it (as in the linked post) is declared to be a Blub user, which is essentially a polite-enough-for-HN way to say "LOL STOOPID NOOOB".
Actually not. There is no code you can write using closures modifying external state that cannot be trivially rewritten in Python using a one-element array in the outer scope which you modify in the inner (without assigning). Therefore Python has that feature in effect. It just doesn't have a piece of dedicated syntax for it.