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Non-overlapping type comparisons and Python type checkers

Alex Chan · published 27 August 2026

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Linklog | astral-sh/ty: An extremely fast Python type checker and language server, written in Rust. Read at the source ↗

https://docs.python.org/3/reference/expressions.html

docs.python.org

https://docs.python.org/3/reference/datamodel.html

docs.python.org

https://mypy.readthedocs.io/en/stable/error_code_list2.html

mypy.readthedocs.io

https://github.com/microsoft/pylance-release/blob/main/docs/diagnostics/reportUnnecessaryContains.md

github.com

https://github.com/astral-sh/ty/issues/576

github.com