# astroid > An abstract syntax tree for Python with inference support. - **URL**: https://www.freshcrate.ai/projects/astroid - **Author**: pypi - **Category**: RAG & Memory - **Latest version**: `4.1.2` (2026-04-21) - **License**: Unknown - **Source**: https://github.com/pylint-dev/astroid/issues - **Homepage**: https://pypi.org/project/astroid/ - **Language**: Python - **GitHub**: 575 stars, 322 forks - **Registry**: pypi (`astroid`) - **Tags**: `abstract`, `analysis`, `code`, `pypi`, `python`, `static`, `syntax`, `tree` ## Description Astroid ======= .. image:: https://codecov.io/gh/pylint-dev/astroid/branch/main/graph/badge.svg :target: https://codecov.io/gh/pylint-dev/astroid :alt: Coverage badge from codecov .. image:: https://readthedocs.org/projects/astroid/badge/?version=latest :target: http://astroid.readthedocs.io/en/latest/?badge=latest :alt: Documentation Status .. image:: https://img.shields.io/badge/code%20style-black-000000.svg :target: https://github.com/ambv/black .. image:: https://results.pre-commit.ci/badge/github/pylint-dev/astroid/main.svg :target: https://results.pre-commit.ci/latest/github/pylint-dev/astroid/main :alt: pre-commit.ci status .. |tidelift_logo| image:: https://raw.githubusercontent.com/pylint-dev/astroid/main/doc/media/Tidelift_Logos_RGB_Tidelift_Shorthand_On-White.png :width: 200 :alt: Tidelift .. list-table:: :widths: 10 100 * - |tidelift_logo| - Professional support for astroid is available as part of the `Tidelift Subscription`_. Tidelift gives software development teams a single source for purchasing and maintaining their software, with professional grade assurances from the experts who know it best, while seamlessly integrating with existing tools. .. _Tidelift Subscription: https://tidelift.com/subscription/pkg/pypi-astroid?utm_source=pypi-astroid&utm_medium=referral&utm_campaign=readme What's this? ------------ The aim of this module is to provide a common base representation of python source code. It is currently the library powering pylint's capabilities. It provides a compatible representation which comes from the `_ast` module. It rebuilds the tree generated by the builtin _ast module by recursively walking down the AST and building an extended ast. The new node classes have additional methods and attributes for different usages. They include some support for static inference and local name scopes. Furthermore, astroid can also build partial trees by inspecting living objects. Installation ------------ Extract the tarball, jump into the created directory and run:: pip install . If you want to do an editable installation, you can run:: pip install -e . If you have any questions, please mail the code-quality@python.org mailing list for support. See http://mail.python.org/mailman/listinfo/code-quality for subscription information and archives. Documentation ------------- http://astroid.readthedocs.io/en/latest/ Python Versions --------------- astroid 2.0 is currently available for Python 3 only. If you want Python 2 support, use an older version of astroid (though note that these versions are no longer supported). Test ---- Tests are in the 'test' subdirectory. To launch the whole tests suite, you can use either `tox` or `pytest`:: tox pytest ## Recent releases | Version | Date | Urgency | Changes | | --- | --- | --- | --- | | `4.1.2` | 2026-04-21 | Low | Imported from PyPI (4.1.2) | | `v4.2.0b1` | 2026-03-23 | Medium | What's New in astroid 4.2.0b1? ============================ Release date: Release date: 2026-03-23 * Changed `block_range` to consider `else` its own block, allowing `pylint` to apply disables to just the block. References pylint-dev/pylint#872 | | `v4.1.2` | 2026-03-22 | Low | What's New in astroid 4.1.2? ============================ Release date: 2026-03-22 * Fix crash accessing property `fset` in generic classes with type annotations. Closes #2996 * Fix infinite recursion caused by cyclic inference in ``Constraint``. * Fix ``RecursionError`` in ``_compute_mro()`` when circular class hierarchies are created through runtime name rebinding. Circular bases are now resolved to the original class instead of recursing. Closes #2967 Closes pyli | | `v4.1.2` | 2026-03-22 | Low | What's New in astroid 4.1.2? ============================ Release date: 2026-03-22 * Fix crash accessing property `fset` in generic classes with type annotations. Closes #2996 * Fix infinite recursion caused by cyclic inference in ``Constraint``. * Fix ``RecursionError`` in ``_compute_mro()`` when circular class hierarchies are created through runtime name rebinding. Circular bases are now resolved to the original class instead of recursing. Closes #2967 Closes pyli | | `v4.1.2` | 2026-03-22 | Low | What's New in astroid 4.1.2? ============================ Release date: 2026-03-22 * Fix crash accessing property `fset` in generic classes with type annotations. Closes #2996 * Fix infinite recursion caused by cyclic inference in ``Constraint``. * Fix ``RecursionError`` in ``_compute_mro()`` when circular class hierarchies are created through runtime name rebinding. Circular bases are now resolved to the original class instead of recursing. Closes #2967 Closes pyli | | `v4.1.2` | 2026-03-22 | Low | What's New in astroid 4.1.2? ============================ Release date: 2026-03-22 * Fix crash accessing property `fset` in generic classes with type annotations. Closes #2996 * Fix infinite recursion caused by cyclic inference in ``Constraint``. * Fix ``RecursionError`` in ``_compute_mro()`` when circular class hierarchies are created through runtime name rebinding. Circular bases are now resolved to the original class instead of recursing. Closes #2967 Closes pyli | | `v4.1.2` | 2026-03-22 | Low | What's New in astroid 4.1.2? ============================ Release date: 2026-03-22 * Fix crash accessing property `fset` in generic classes with type annotations. Closes #2996 * Fix infinite recursion caused by cyclic inference in ``Constraint``. * Fix ``RecursionError`` in ``_compute_mro()`` when circular class hierarchies are created through runtime name rebinding. Circular bases are now resolved to the original class instead of recursing. Closes #2967 Closes pyli | | `v4.1.2` | 2026-03-22 | Low | What's New in astroid 4.1.2? ============================ Release date: 2026-03-22 * Fix crash accessing property `fset` in generic classes with type annotations. Closes #2996 * Fix infinite recursion caused by cyclic inference in ``Constraint``. * Fix ``RecursionError`` in ``_compute_mro()`` when circular class hierarchies are created through runtime name rebinding. Circular bases are now resolved to the original class instead of recursing. Closes #2967 Closes pyli | | `v4.1.2` | 2026-03-22 | Low | What's New in astroid 4.1.2? ============================ Release date: 2026-03-22 * Fix crash accessing property `fset` in generic classes with type annotations. Closes #2996 * Fix infinite recursion caused by cyclic inference in ``Constraint``. * Fix ``RecursionError`` in ``_compute_mro()`` when circular class hierarchies are created through runtime name rebinding. Circular bases are now resolved to the original class instead of recursing. Closes #2967 Closes pyli | | `v4.1.2` | 2026-03-22 | Low | What's New in astroid 4.1.2? ============================ Release date: 2026-03-22 * Fix crash accessing property `fset` in generic classes with type annotations. Closes #2996 * Fix infinite recursion caused by cyclic inference in ``Constraint``. * Fix ``RecursionError`` in ``_compute_mro()`` when circular class hierarchies are created through runtime name rebinding. Circular bases are now resolved to the original class instead of recursing. Closes #2967 Closes pyli | ## Dependency audit - **Score**: 76/100 - **Total deps**: 1 - **Resolved**: 0 - **Unresolved**: 1 - **License conflicts**: 0 - **Warnings**: 2 - **Scanned**: 2026-05-25 ## Citation - HTML: https://www.freshcrate.ai/projects/astroid - Markdown: https://www.freshcrate.ai/projects/astroid.md - Dependencies JSON: https://www.freshcrate.ai/api/projects/astroid/deps _Generated by freshcrate.ai. Indexes pypi releases for AI-agent ecosystem packages._