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TypedDict: clarify that a non-ReadOnly key cannot be redeclared as ReadOnly. #1859

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Sep 27, 2024
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TypedDict: clarify that a non-ReadOnly key cannot be redeclared as ReadOnly. #1859

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3 changes: 2 additions & 1 deletion docs/spec/typeddict.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -749,7 +749,8 @@ only if all of the following are satisfied:
* For each item in ``A``, if ``B`` has the corresponding key, the corresponding
value type in ``B`` is assignable to the value type in ``A``.
* For each non-read-only item in ``A``, its value type is assignable to the
corresponding value type in ``B``.
corresponding value type in ``B``, and the corresponding key is not read-only
in ``B``.
* For each required key in ``A``, the corresponding key is required in ``B``.
* For each non-required key in ``A``, if the item is not read-only in ``A``,
the corresponding key is not required in ``B``.
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