PEP 728: Improve specification #4166
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- Specify that extra_items and closed are also supported with the functional syntax. - Rewrite the rules for `closed=True` and inheritance. I attempted to make `closed=True` exactly equivalent to `extra_items=Never` in terms of inheritance. The semantics as specified in the previous version of the PEP felt harder to understand and less consistent. - Fix some incorrect comments regarding expected type checker errors. - Clarify section on assignability with Mapping - Add section on runtime behavior. I tried to make the intended runtime behavior simple to implement and understand. This makes the runtime simpler but may make life more complicated for tools consuming the metadata.
mnoori1201
approved these changes
Dec 13, 2024
PIG208
approved these changes
Dec 14, 2024
PIG208
approved these changes
Dec 15, 2024
rchen152
approved these changes
Dec 17, 2024
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functional syntax.
closed=Trueand inheritance. I attemptedto make
closed=Trueexactly equivalent toextra_items=Neverinterms of inheritance. The semantics as specified in the previous
version of the PEP felt harder to understand and less consistent.
behavior simple to implement and understand. This makes the runtime
simpler but may make life more complicated for tools consuming the
metadata.
This grew out of work on python/typing-extensions#519. cc @PIG208
📚 Documentation preview 📚: https://pep-previews--4166.org.readthedocs.build/