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chore(deps-dev): bump mypy from 1.4 to 2.3.0#1821

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chore(deps-dev): bump mypy from 1.4 to 2.3.0#1821
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@dependabot dependabot Bot commented on behalf of github Jul 21, 2026 •
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Bumps mypy from 1.4 to 2.3.0.

Changelog

Sourced from mypy's changelog.

Mypy Release Notes

Next Release

Packaging changes

Mypy 2.3

We've just uploaded mypy 2.3.0 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.

The Upcoming Switch to the New Native Parser

We are planning to enable the new native parser (--native-parser) by default soon. We recommend that you test the native parser in your projects and report any issues in the mypy issue tracker.

Mypyc Free-threading Memory Safety

Free-threaded Python builds that don't have the GIL require additional synchronization primitives or lock-free algorithms to ensure memory safety when there are race conditions (for example, when a thread reads a list item while another thread writes the same list item concurrently). This release greatly improves memory safety of free threading.

List operations are now memory-safe on free threaded Python builds, even in the presence of race conditions. This has some performance cost. For list-heavy workloads, using librt.vecs.vec instead of list is often significantly faster, but note that vec is not (and likely won't be) fully memory safe, and the user is expected to avoid race conditions. The newly introduced librt.threading.Lock helps with this. Using variable-length tuples can also be more efficient than lists, since tuples are immutable and don't require expensive synchronization to ensure memory safety.

Instance attribute access is also (mostly) memory safe now on free-threaded builds in the presence of race conditions. We are planning to fix the remaining unsafe cases in a future release.

Full list of changes:

  • Make attribute access memory safe on free-threaded builds (Jukka Lehtosalo, PR 21705)
  • Fix unsafe borrowing of instance attributes with free-threading (Jukka Lehtosalo, PR 21688)
  • Make list get/set item more memory safe on free-threaded builds (Jukka Lehtosalo, PR 21683)
  • Don't borrow list items on free-threaded builds (Jukka Lehtosalo, PR 21679)
  • Make multiple assignment from list memory-safe on free-threaded builds (Jukka Lehtosalo, PR 21684)

... (truncated)

Commits
  • 8aabf84 Drop +dev from version
  • 4d8ad2a Update changelog for 2.3 release (#21728)
  • 2c21546 [mypyc] Update documentation of race conditions under free threading (#21726)
  • a9f62a3 [mypyc] Make attribute access memory safe on free-threaded builds (#21705)
  • 0faa413 Use PYODIDE environment variable for Emscripten cross-compilation detection...
  • 3d75cdb [mypyc] Borrow final attributes more aggressively (#21702)
  • 24c237d [mypyc] Improve documentation of Final (#21713)
  • b5be217 [mypyc] Update free threading Python compatibility docs (#21711)
  • cbcb51a Narrow for frozendict membership check (#21709)
  • af2bc0f Sync typeshed (#21707)
  • Additional commits viewable in compare view

@dependabot dependabot Bot added dependencies Pull requests that update a dependency file python Pull requests that update python code labels Jul 21, 2026
@jacalata jacalata mentioned this pull request Jul 22, 2026
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@jacalata

jacalata commented Jul 22, 2026

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Depends on #1826 — that PR fixes the mypy 2.3 compatibility errors that this bump would surface. Please merge #1826 first.

@dependabot
chore(deps-dev): bump mypy from 1.4 to 2.3.0
05bfde3 
Bumps [mypy](https://github.com/python/mypy) from 1.4 to 2.3.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.4.0...v2.3.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 2.3.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot
dependabot Bot force-pushed the dependabot/pip/development/mypy-2.3.0 branch from 56b0ba4 to 05bfde3 Compare July 22, 2026 06:48
jacalata added a commit that referenced this pull request Jul 23, 2026
@jacalata @dependabot @claude
fix: resolve mypy 2.3 type errors (unblocks dependabot #1821) (#1826)
09ffa11 
* chore(deps-dev): bump mypy from 1.4 to 2.3.0

Bumps [mypy](https://github.com/python/mypy) from 1.4 to 2.3.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.4.0...v2.3.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 2.3.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* fix: resolve mypy 2.3 errors in strings.py and test_datasource.py

- strings.py: cast tostring() return value to T since mypy 2.3 no longer
  accepts bytes as compatible with TypeVar T constrained to str|bytes
- test_datasource.py: add explicit `import unittest.mock` since mypy 2.3
  no longer resolves submodule attributes through the parent import

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix: correctly resolve mypy 2.3 TypeVar error in strings.py

The bytes overload was passing bytearray to _redact_any_type whose TypeVar T
is constrained to str|bytes. mypy 2.3 correctly rejects bytearray as Sequence[int].
Fix: pass bytes directly and cast the return value for both call sites.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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github-actions Bot commented Jul 23, 2026

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Coverage

Coverage Report
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TOTAL11973142388% 

@jacalata

jacalata commented Jul 23, 2026

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actually instead of unblocking it, the other MR just made the change :D

@jacalata jacalata closed this Jul 23, 2026
@dependabot @github

dependabot Bot commented on behalf of github Jul 23, 2026

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OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.

@dependabot
dependabot Bot deleted the dependabot/pip/development/mypy-2.3.0 branch July 23, 2026 20:25
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