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@dependabot dependabot bot commented on behalf of github Sep 26, 2025

Bumps mypy from 1.18.1 to 1.18.2.

Changelog

Sourced from mypy's changelog.

Mypy 1.18.1

We’ve just uploaded mypy 1.18.1 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 1.18.1 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)
  • Optimize binding method self argument type and deprecation checks (Ivan Levkivskyi, PR 19556)
  • Keep trivial instance types/aliases during expansion (Ivan Levkivskyi, PR 19543)

Fixed‑Format Cache (Experimental)

... (truncated)

Commits
  • df05f05 remove +dev from version
  • 01a7a12 Update changelog for 1.18.2 (#19873)
  • ca5abf0 Typeshed cherry-pick: Make type of unitest.mock.Any a subclass of Any (#1...
  • 9d794b5 [mypyc] fix: inappropriate Nones in f-strings (#19846)
  • 2c0510c stubtest: additional guidance on errors when runtime is object.init (#19733)
  • 2f3f03c Bump version to 1.18.2+dev for point release
  • 7669841 Fix crash on recursive alias in indirection.py (#19845)
  • See full diff in compare view

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@dependabot dependabot bot added dependencies Pull requests that update a dependency file python Pull requests that update Python code labels Sep 26, 2025
@dependabot dependabot bot requested a review from a team as a code owner September 26, 2025 20:10
@dependabot dependabot bot added the dependencies Pull requests that update a dependency file label Sep 26, 2025
@dependabot dependabot bot requested a review from anafalcao September 26, 2025 20:10
@dependabot dependabot bot added the python Pull requests that update Python code label Sep 26, 2025
@pull-request-size pull-request-size bot added the size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. label Sep 26, 2025
@github-actions github-actions bot added the internal Maintenance changes label Sep 26, 2025
Bumps [mypy](https://github.com/python/mypy) from 1.18.1 to 1.18.2.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.18.1...v1.18.2)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.18.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot bot force-pushed the dependabot/pip/develop/mypy-1.18.2 branch from 3f8e7e8 to 52de361 Compare September 27, 2025 14:06
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@leandrodamascena leandrodamascena merged commit 8cad7bf into develop Sep 27, 2025
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@leandrodamascena leandrodamascena deleted the dependabot/pip/develop/mypy-1.18.2 branch September 27, 2025 14:18
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codecov bot commented Sep 27, 2025

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.37%. Comparing base (d4f0932) to head (c257929).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files
@@           Coverage Diff            @@
##           develop    #7435   +/-   ##
========================================
  Coverage    96.37%   96.37%           
========================================
  Files          275      275           
  Lines        13048    13048           
  Branches       974      974           
========================================
  Hits         12575    12575           
  Misses         366      366           
  Partials       107      107           

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