Hi everyone,

I've submitted PEP 589 to the PEPs repository. This PEP proposes a new kind of type, TypedDict, for representing dictionaries with a fixed set of keys. These can be be used to represent JSON objects, for example.

Discussion on the PEP happens here in typing-sig@. Minor things can be fixed directly as PRs.

Here is the full PEP draft:

https://www.python.org/dev/peps/pep-0589/

Mypy supports TypedDict and the relevant documentation may also be helpful (but the PEP takes priority over mypy documentation):

https://mypy.readthedocs.io/en/latest/more_types.html#typeddict

Jukka

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