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Mypy Release Notes

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Mypy 1.8

We’ve just uploaded mypy 1.8 to the Python Package Index (PyPI). Mypy is a static type checker for Python. This release includes new features, performance improvements and bug fixes. You can install it as follows:

python3 -m pip install -U mypy

You can read the full documentation for this release onRead the Docs.

Type-checking Improvements

• Do not intersect types in isinstance checks if at least one is final (Christoph Tyralla, PR16330)
• Detect that@final class without__bool__ cannot have falsey instances (Ilya Priven, PR16566)
• Do not allowTypedDict classes with extra keywords (Nikita Sobolev, PR16438)
• Do not allow class-level keywords forNamedTuple (Nikita Sobolev, PR16526)
• Make imprecise constraints handling more robust (Ivan Levkivskyi, PR16502)
• Fix strict-optional in extending generic TypedDict (Ivan Levkivskyi, PR16398)
• Allow type ignores of PEP 695 constructs (Shantanu, PR16608)
• Enabletype_check_only support forTypedDict andNamedTuple (Nikita Sobolev, PR16469)

Performance Improvements

• Add fast path to analyzing special form assignments (Jukka Lehtosalo, PR16561)

Improvements to Error Reporting

• Don't show documentation links for plugin error codes (Ivan Levkivskyi, PR16383)
• Improve error messages forsuper checks and add more tests (Nikita Sobolev, PR16393)
• Add error code for mutable covariant override (Ivan Levkivskyi, PR16399)

Stubgen Improvements

• Preserve simple defaults in function signatures (Ali Hamdan, PR15355)
• Include__all__ in output (Jelle Zijlstra, PR16356)
• Fix stubgen regressions with pybind11 and mypy 1.7 (Chad Dombrova, PR16504)

Stubtest Improvements

• Improve handling of unrepresentable defaults (Jelle Zijlstra, PR16433)
• Print more helpful errors if a function is missing from stub (Alex Waygood, PR16517)
• Support@type_check_only decorator (Nikita Sobolev, PR16422)
• Warn about missing__del__ (Shantanu, PR16456)
• Fix crashes with some uses offinal anddeprecated (Shantanu, PR16457)

Fixes to Crashes

• Fix crash with type alias toCallable[[Unpack[Tuple[Any, ...]]], Any] (Alex Waygood, PR16541)
• Fix crash on TypeGuard in__call__ (Ivan Levkivskyi, PR16516)
• Fix crash on invalid enum in method (Ivan Levkivskyi, PR16511)
• Fix crash on unimported Any in TypedDict (Ivan Levkivskyi, PR16510)

Documentation Updates

• Update soft-error-limit default value to -1 (Sveinung Gundersen, PR16542)

... (truncated)

• 3b46750 remove +dev suffix from version
• c9bc833 Fix tests broken by hatchling (#16655)
• 60d30e3 Fix crash with type alias toCallable[[Unpack[Tuple[Any, ...]]], Any] (#16541)
• f53f422 Allow type ignores of PEP 695 constructs (#16608)
• 7c33e7c@​final class withoutbool cannot have falsey instances (#16566)
• c224da5 Do not intersect types in isinstance checks if at least one is final (#16330)
• d54cc35 Change example in test cases with no stubs available (#16513)
• eb1ee97 Update hashes insync-typeshed.py following recent typeshed sync (#16600)
• 344298e Revert use ofParamSpec forfunctools.wraps
• 3e5d813 Revert typeshed ctypes change
• Additional commits viewable incompare view

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