ty 0.0.75

on Python PyPI

Release Notes

Released on 2026-08-26.

Preview features

• Initialize PEP 723 script environments in the CLI (#27544)
• Refresh PEP 723 script environments in watch mode (#27617)
• Run PEP 723 script synchronization on bounded workers (#27615)

Bug fixes

• Specialize Self bounds of inherited methods (#27990)

LSP server

• Add "Go to Definition" support for pytest fixtures (#27444)

Documentation

• Fix documented Python package build command (#4384)
• Link untyped-call tracking issue in migration guide (#4382)

Library support

• Resolve imported pytest fixture exposures (#27539)
• Resolve installed core pytest fixture providers (#27770)
• Resolve pytest fixtures through conftest (#27540)

Diagnostics

• Add more autofixes (#28029)
• Add a dedicated missing-slot diagnostic (#28039)
• Explain missing storage for declared slotted attributes (#27969)
• Improve diagnostic spans for unpacked variable assignments (#28041)

Core type checking

• Account for known subclasses in equality inference (#28005)
• Expand ParamSpec signatures inferred from bound receivers (#28020)
• Fix Self binding in ParamSpec protocols (#28016)
• Fix TypedDict variance inference (#28052)
• Fix unsound narrowing through branch-assigned conditions (#28006)
• Ignore inconsistent binding decorators on overloads (#28036)
• Infer yield from send/return types from the iterator returned by __iter__ (#27987)
• Infer tuple type parameters from union arguments (#28062)
• Infer variance through nonrecursive protocol references (#28065)
• Preserve bounds of non-literal metaclasses (#28046)
• Preserve correlated generic-call inference (#28043)
• Preserve invariant materialization constraints (#28047)
• Recover bare TypeVarTuples in tuple annotations (#27950)
• Reject fixed tuples for non-inferable TypeVarTuples (#27943)
• Reject incompatible constructor context for variadic packs (#27966)
• Support mixed gradual tuple assignability with TypeVarTuple (#27957)
• Support tagged union with multiple tags per type (#27984)
• Sync vendored typeshed stubs (#28035). Typeshed diff
• Treat typing.Union as a class on Python 3.14+ (#28003)
• Validate generic protocol variance (#27531)
• collections.abc.Callable is an instance of type (#27991)

Contributors

• @sharkdp
• @jelle-openai
• @marcelo-souzaf
• @AlexWaygood
• @krzkaczor
• @carljm
• @charliermarsh
• @lerebear
• @MichaReiser

Install ty 0.0.75

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.75/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.75/ty-installer.ps1 | iex"

Download ty 0.0.75

Verifying GitHub Artifact Attestations

The artifacts in this release have attestations generated with GitHub Artifact Attestations. These can be verified by using the GitHub CLI:

gh attestation verify <file-path of downloaded artifact> --repo astral-sh/ty

You can also download the attestation from GitHub and verify against that directly:

gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>