---
id: typed-ast
version: "1.5.5"
license: Apache License 2.0
license_treatment: permissive
maintenance: abandoned
---

# typed-ast — a fork of Python 2 and 3 ast modules with type comment support

License: permissive · Maintenance: abandoned · Downloads: 4.3M/mo

## What it is and what it does

typed_ast is an abandoned Python package that provided AST (abstract syntax tree) parsers for Python 2.7 and Python 3 code with support for PEP 484 type comments. It was designed to parse type annotations in comments, a feature that predated Python's native type hint syntax. The parsers were independent of the Python version running them, allowing you to parse code written for different Python versions from a single environment.

The package is no longer maintained and should not be used for new projects. Python 3.8 and later versions incorporated all of typed_ast's functionality into the standard library `ast` module, making typed_ast obsolete. The project's repository is archived, with the last commit on 2023-07-03. If you encounter typed_ast as a dependency, migration to the standard library is strongly recommended.

Use it for:

- Legacy projects that parse Python 2.7 code with type comments from a Python 3 environment (use standard `ast` if possible).
- Tools that need to extract type information from older codebases written before native type hints existed.
- Transitional codebases migrating from Python 2 to Python 3 that need unified parsing logic.

## Worth the install?

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

Provides Python 2.7 and Python 3 AST parsers with PEP 484 type comment support, independent of the Python version running the parser.

No. Do not install typed_ast for new projects. The package is abandoned and superseded entirely by the standard library `ast` module in Python 3.8+. If you encounter it as a transitive dependency, work with maintainers to remove it. For Python 3.6–3.7 projects, migrate to the standard `ast` module where possible; typed_ast offers no advantages on modern Python versions.

## Install

pip install typed-ast
uv add typed-ast
poetry add typed-ast

## Installing typed-ast

Before you install: Medium install friction due to compiled wheels for multiple platforms. Project is abandoned as of 2023-07-03 with no further maintenance; the standard library `ast` module in Python 3.8+ supersedes all functionality.

License in practice: Apache License 2.0 is permissive, allowing use in most contexts without significant restriction.

Quickstart:

pip install typed-ast==1.5.5
import typed_ast.ast3 as ast
tree = ast.parse('x: int = 5', mode='exec', feature_version=(3, 7))

Project is no longer maintained; Python 3.8+ users should use the standard library `ast` module instead.

Verify before relying:

- Whether any downstream packages still actively depend on typed_ast or if migration paths are documented.
- Performance characteristics compared to the standard library `ast` module on modern Python versions.

## Package facts

- License: Apache License 2.0 (permissive)
- Python support: supports_current
- Install friction: medium
- Maintenance: abandoned
- Downloads: 4.3M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

python ast parser with type comments, parse python 2.7 syntax, pep 484 type comment parsing, typed abstract syntax tree, python code parsing type hints, deprecated, ast-parsing, type-comments

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