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Bumps mypy from 1.17.1 to 1.18.1.

Changelog

Sourced from mypy's changelog.

Mypy Release Notes

Next Release

Mypy 1.18

We’ve just uploaded mypy 1.18 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 on Read the Docs.

Mypy Performance Improvements

Mypy 1.18 includes numerous performance improvements, resulting in about 40% speedup compared to 1.17 when type checking mypy itself. In extreme cases, the improvement can be 10x or higher. The list below is an overview of the various mypy optimizations. Many mypyc improvements (discussed in a separate section below) also improve performance.

Type caching optimizations have a small risk of causing regressions. When reporting issues with unexpected inferred types, please also check if --disable-expression-cache will work around the issue, as it turns off some of these optimizations.

  • Improve self check performance by 1.8% (Jukka Lehtosalo, PR 19768, 19769, 19770)
  • Optimize fixed-format deserialization (Ivan Levkivskyi, PR 19765)
  • Use macros to optimize fixed-format deserialization (Ivan Levkivskyi, PR 19757)
  • Two additional micro‑optimizations (Ivan Levkivskyi, PR 19627)
  • Another set of micro‑optimizations (Ivan Levkivskyi, PR 19633)
  • Cache common types (Ivan Levkivskyi, PR 19621)
  • Skip more method bodies in third‑party libraries for speed (Ivan Levkivskyi, PR 19586)
  • Simplify the representation of callable types (Ivan Levkivskyi, PR 19580)
  • Add cache for types of some expressions (Ivan Levkivskyi, PR 19505)
  • Use cache for dictionary expressions (Ivan Levkivskyi, PR 19536)
  • Use cache for binary operations (Ivan Levkivskyi, PR 19523)
  • Cache types of type objects (Ivan Levkivskyi, PR 19514)
  • Avoid duplicate work when checking boolean operations (Ivan Levkivskyi, PR 19515)
  • Optimize generic inference passes (Ivan Levkivskyi, PR 19501)
  • Speed up the default plugin (Jukka Lehtosalo, PRs 19385 and 19462)
  • Remove nested imports from the default plugin (Ivan Levkivskyi, PR 19388)
  • Micro‑optimize type expansion (Jukka Lehtosalo, PR 19461)
  • Micro‑optimize type indirection (Jukka Lehtosalo, PR 19460)
  • Micro‑optimize the plugin framework (Jukka Lehtosalo, PR 19464)
  • Avoid temporary set creation in subtype checking (Jukka Lehtosalo, PR 19463)
  • Subtype checking micro‑optimization (Jukka Lehtosalo, PR 19384)
  • Return early where possible in subtype check (Stanislav Terliakov, PR 19400)
  • Deduplicate some types before joining (Stanislav Terliakov, PR 19409)
  • Speed up type checking by caching argument inference context (Jukka Lehtosalo, PR 19323)

... (truncated)

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Bumps [mypy](https://github.com/python/mypy) from 1.17.1 to 1.18.1.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.17.1...v1.18.1)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.18.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
@dependabot dependabot bot added dependencies Pull requests that update a dependency file python Pull requests that update python code labels Sep 12, 2025
@Tert0 Tert0 merged commit be2ed55 into develop Sep 12, 2025
2 checks passed
@dependabot dependabot bot deleted the dependabot/pip/mypy-1.18.1 branch September 12, 2025 10:48
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