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Bump mypy from 1.19.1 to 2.1.0#1272

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Bump mypy from 1.19.1 to 2.1.0#1272
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dependabot/pip/mypy-2.1.0

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@dependabot dependabot Bot commented on behalf of github Jul 1, 2026

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Bumps mypy from 1.19.1 to 2.1.0.

Changelog

Sourced from mypy's changelog.

Mypy Release Notes

Next Release

Mypy 2.1

We’ve just uploaded mypy 2.1.0 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.

librt.vecs: Fast Growable Array Type for Mypyc

The new librt.vecs module provides an efficient growable array type vec that is optimized for mypyc use. It provides fast, packed arrays with integer and floating point value types, which can be several times faster than list, and tens of times faster than array.array in code compiled using mypyc. It also supports nested vec objects and non-value-type items, such as vec[vec[str]].

Refer to the documentation for the details.

Contributed by Jukka Lehtosalo.

librt.random: Fast Pseudo-Random Number Generation

The new librt.random module provides fast pseudo-random number generation that is optimized for code compiled using mypyc. It can be 3x to 10x faster than the stdlib random module in compiled code.

Refer to the documentation for the details.

Contributed by Jukka Lehtosalo (PR 21433).

Mypyc Improvements

  • Enable incremental self-compilation (Vaggelis Danias, PR 21369)
  • Make compilation order with multiple files consistent (Piotr Sawicki, PR 21419)
  • Fix crash on accessing StopAsyncIteration (Piotr Sawicki, PR 21406)
  • Fix incremental compilation with separate flag (Vaggelis Danias, PR 21299)

Fixes to Crashes

  • Fix crash on partial type with --allow-redefinition and global declaration (Jukka Lehtosalo, PR 21428)
  • Fix broken awaitable generator patching (Ivan Levkivskyi, PR 21435)

... (truncated)

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Bumps [mypy](https://github.com/python/mypy) from 1.19.1 to 2.1.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.19.1...v2.1.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 2.1.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot added dependencies Pull requests that update a dependency file python Pull requests that update Python code labels Jul 1, 2026
@dependabot dependabot Bot requested a review from aaschaer as a code owner July 1, 2026 09:22
@dependabot dependabot Bot added the python Pull requests that update Python code label Jul 1, 2026
mypy 2.x incorrectly treats `MISSING` as having type `Any` after an `is`
comparison with a value of type `Any`, which results in failures under
`no-return-any`.

Rephrase the various omittable types to be more explicit about accepting
`MissingType`, which also requires that we explicitly handle the
`MISSING` case which we do not support -- with a `NotImplementedError` in
order to clarify that there's no intent to support such usage.

We also have to remove a `super().convert()` call which (1) does nothing
and (2) munges the type of `value` in `CommaDelimitedList.convert`.

See also: python/mypy#21667
@sirosen sirosen force-pushed the dependabot/pip/mypy-2.1.0 branch from 6a32532 to 413ecdd Compare July 1, 2026 20:34
@sirosen

sirosen commented Jul 1, 2026

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I pushed a fix for the mypy failure and filed an upstream bug with mypy about this.

Someone else should review this PR -- I'm now a co-author on it.

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