> My bigger question is how does a professor of machine learning does not know about one of the oldest Python footguns to exist Because there's a lot of them.

> My bigger question is how does a professor of machine learning does not know about one of the oldest Python footguns to exist Because there's a lot of them. And as soon as you touch a sane language that fits your intuitive model of how things should work, going back to Python means that you'll start doing intuitive things that Python will happily and silently transform into unintuitive operations.