I am curious why lists do not have ".map" and ".filter" methods? IMHO it would be so better for chaining, now using a few maps and filters is inconvenient and looks unreadable.
Plus, something shorter for "lambda"...
It's one of not too man aspects, where I prefer JavaScript (especially ES6) to Python.
That would require any new container classes to implement each of those methods again (and will probably still lack useful ones, like groupby) whereas currently they can just implement iteration and get the rest for free.
You could have both approaches, but that would go against one of Python's core principles ("There should be one-- and preferably only one --obvious way to do it.").
It's one of not too man aspects, where I prefer JavaScript (especially ES6) to Python.