That's a great link and recommended reading.

It explains a lot about the design of Python container classes, and the boundaries of polymorphism / duck typing with them, and mutation between them.

I don't always agree with the choices made in Python's container APIs...but I always want to understand them as well as possible.

Also worth noting that understanding changes over time. Remember when GvR and the rest of the core developers argued adamantly against ordered dictionaries? Haha! Good times! Thank goodness their first wave of understanding wasn't their last. Concurrency and parallelism in Python was a TINY issue in 2006, but at the forefront of Python evolution these days. And immutability has come a long way as a design theme, even for languages that fully embrace stateful change.