---
id: types-mypy-extensions
version: "1.1.0.20260724"
license: Apache-2.0
license_treatment: permissive
maintenance: active
---

# types-mypy-extensions — Typing stubs for mypy-extensions

License: permissive · Maintenance: active · Downloads: 148.9K/mo

## What it is and what it does

This package is a type stub distribution for mypy-extensions, part of the typeshed project. Type stubs are files that describe the types and signatures of a library's public interface without containing implementation code. When you install this package alongside mypy-extensions, type checkers like mypy and pyright can understand and validate code that uses mypy-extensions, catching type errors at development time rather than runtime.

The stubs are maintained centrally in typeshed and generated from that repository. They target mypy-extensions version 1.1.x and have been tested with mypy 2.3.0 and pyright 1.1.411. Since this is a stub-only package with no runtime dependencies, it adds no overhead to your application—it exists purely to improve type-checking quality during development.

Use it for:

- Enable mypy or pyright to type-check code that uses mypy-extensions without false positives or missing type information.
- Develop type-safe applications that depend on mypy-extensions while catching type errors before runtime.
- Contribute to or maintain projects that use mypy-extensions and want full IDE and linter support.
- Ensure compatibility between your codebase and mypy-extensions' public API through static type analysis.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides type stubs for mypy-extensions, enabling type checkers like mypy and pyright to understand code using the mypy-extensions library.

Yes, if you use mypy-extensions and want type checking. Install it as a development dependency alongside mypy or pyright. It has no runtime cost, is actively maintained, and requires only Python 3.10+. No security concerns and permissive licensing. Skip it only if you don't use mypy-extensions or don't use a type checker.

## Install

pip install types-mypy-extensions
uv add types-mypy-extensions
poetry add types-mypy-extensions

## Installing types-mypy-extensions

Before you install: Low install friction with no runtime dependencies. Actively maintained as part of the typeshed project, with a recent release (21 days old) and ongoing repository activity.

License in practice: Licensed under Apache-2.0 (permissive), allowing free use, modification, and distribution with minimal restrictions.

Quickstart:

pip install types-mypy-extensions

# Then use mypy or pyright to type-check code that imports mypy-extensions
# mypy will automatically discover and use these stubs

Requires Python 3.10 or later.

Verify before relying:

- Whether these stubs cover all public APIs of mypy-extensions 1.1.x or only a subset.
- How frequently stubs are updated when mypy-extensions itself receives updates.

## Package facts

- License: Apache-2.0 (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 148.9K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

type stubs mypy-extensions, mypy-extensions typing, type checking mypy-extensions, typeshed stubs, mypy type hints, pyright type stubs, python typing annotations, type-stubs, type-checking

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