[matjet]

I do not see the use for this, over the standard access methods.

    people = {
        "Diane": 70,
        "Bob": 78,
        "Emma": 84
    }

    people.get("Bob")
    # 78

The common usecase is:

    for key in people.keys():
        people.get(key)

vs

    keys = people.keys()
    # dict_keys(['Diane', 'Bob', 'Emma'])

    for key in keys:
        keys.mapping[key]

What is the advantage?

[ssl232]

It gives you access to the original dictionary from a view. I've not played with it yet but I guess that means you can modify it.

EDIT: apparently not:

    >>> keys.mapping
    mappingproxy({'Diane': 70, 'Bob': 78, 'Emma': 84})

In this case I actually don't know what the use case is :shrug:

[mjw1007]

The rationale was here.

https://github.com/python/cpython/issues/85067#issuecomment-...

It seems a bit vague: « Exposing this attribute would help with introspection, making it possible to write efficient functions that operate on dict views. »