[avremel]

I was surprised to find out that MyPy will throw an error if you use a variable to access a key (https://github.com/python/mypy/issues/7178).

Optional keys are also a nuisance.

[dharmab]

How are optional keys a nuisance? I find that using the patterns:

    if "optional_key" in my_dict:
        do_something_with(my_dict["optional_key"])

Or:

    optional_value = my_dict.get("optional_key")
    if optional_value:
        do_something_with(optional value)

Works as expected. Nested optional keys can be a bit annoying, although:

    my_dict.get("optional_parent", {}).get("optional_child")

seems to work.

[avremel]

I was referring to defining optional keys.

If you have a dict with some keys which are optional, you need to create a separate subclass (with `total=False`) just for those optional keys.

With TypeScript, I can just use `key?: type`.

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