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Support recursive TypedDicts by ilevkivskyi · Pull Request #13373 · python/mypy · GitHub
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This is a continuation of #13297
Depends on #13371

It was actually quite easy, essentially just a 1-to-1 mapping from the other PR. I will rebase when the first PR will be merged.

cc @JukkaL

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The mypy_primer effect is all from base PR, so the effect of this one is zero.

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Not a full review -- left some ideas about additional tests.

b: TDB

td: TD
reveal_type(td) # N: Revealed type is "TypedDict('__main__.TD', {'xb': builtins.int, 'yb': ..., 'xa': builtins.int, 'ya': ..., 'a': TypedDict('__main__.TDA', {'xa': builtins.int, 'ya': ...}), 'b': TypedDict('__main__.TDB', {'xb': builtins.int, 'yb': ...})})"
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Test constructing recursive TypedDicts, e.g. TD(...) (with different levels of nesting) and td: TD = {...}.

Test calling some methods on recursive typeddicts.

Test indexed assignment to a recursive typeddict.

==
b.py:3: error: Unsupported operand types for + ("int" and "str")

[case testTypedDictUpdate3]
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Test coarse-grained incremental checking with recursive TypedDicts (i.e. serialization).

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Well it looks like merging didn't go perfect. Anyway the diff is correct, it is just the commit history shown includes commits from the previous PR. I added a bunch of tests as requested plus also some basic subtyping and joins.

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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

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LGTM, thanks for the PR! Recursive TypedDicts are a nice feature.

@ilevkivskyi ilevkivskyi merged commit cba07d7 into python:master Aug 11, 2022
@ilevkivskyi ilevkivskyi deleted the recursive-typed-dicts branch August 11, 2022 12:41
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