Comments (3)
gvanrossum
commented on June 21, 2024
Ah, that came up in a Discourse thread.
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Daverball
commented on June 21, 2024
I like the heuristic of None (and maybe Literal[False] for subtyping completeness?) meaning it can't suppress and bool, bool | None (and Literal[True]) meaning it may, it's easy to understand and for library authors to follow.
Although I think it follows that eventually AbstractContextManager should become generic in the return type of __exit__ with an upper bound of bool | None, but that change would be too disruptive without PEP696 defaulting the second parameter to bool | None. I've already prototyped a change just for ExitStack itself based on the discourse discussion, but even that was too disruptive without type var defaults.
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JelleZijlstra
commented on June 21, 2024
Addressed by python/typing-council#27.
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Related Issues (20)
- Out-of-date description of how to indicate positional-only parameters
- Typing spec should be clearer that type checkers are not expected to support PEP 3141 HOT 22
- Incorporate PEP 483 into the spec HOT 5
- Conformance tests: Add mechanism to allow errors on one of multiple lines HOT 2
- Conformance tests: Add mechanism to ignore errors
- Conformance tests: Align automated and manual scoring HOT 1
- Introduce a `Language` type to provide consistent language information of strings. HOT 5
- Spec: Version and platform checking underspecified HOT 6
- Support list comprehension for `TypeVarTuple` HOT 2
- Clarify the float/int/complex special case HOT 5
- Clarify the implications of subclassing Any HOT 1
- Allow multiple `TypeVarTuple` in Generic Classes when they are wrapped. HOT 5
- pytype conformance tests crash if no `python3.11` executable is in `PATH` HOT 5
- Conformance test: make dataclass_hash.py not rely on `typing.Hashable`? HOT 1
- Proposal: Add coerced type narrowing similar to 'cast' HOT 1
- Idenity Type HOT 2
- [spec] clarify assert_type behavior as asserting type equivalence
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