astroid
An abstract syntax tree for Python with inference support.
Decision gist · record as of 2026-08-14
Yes. Astroid is a mature, actively maintained library with no known vulnerabilities, low install friction, and broad Python version support. The copyleft license requires review if you're building proprietary tools, but it's the standard foundation for Python static analysis. Install it if you're building or extending code-quality tooling.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low friction installation with a single lightweight runtime dependency (typing-extensions).
- Active maintenance with a release within the past week and regular updates across modern Python versions.
License · maintenance · safety
LGPL-2.1-or-later (copyleft) — Licensed under LGPL-2.1-or-later (copyleft). Derivative works and modifications must be distributed under compatible terms; proprietary applications using astroid as a library should review copyleft obligations.
last release 2026-08-07 (7 days) · last repo commit 2026-08-12 · 581 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 55,355,505 downloads/mo, #537 on PyPI
Alternatives
Verify before relying
pip install astroid
import astroid
module = astroid.parse('x = 1')
for node in module.nodes_of_class(astroid.Assign):
print(node)- Whether static inference covers all Python language constructs or has known limitations in specific scenarios.
- Performance characteristics when analyzing large codebases or deeply nested AST structures.
What it is and what it does
Astroid extends Python's built-in AST module by walking the syntax tree and building enhanced node classes with additional methods, attributes, and capabilities for static analysis. It provides a common intermediate representation used by pylint and other code-quality tools to understand and reason about Python source code.
The library rebuilds the standard AST with support for static type inference and local name scopes, allowing tools to track variable definitions, resolve names, and perform semantic analysis beyond simple syntactic parsing. It can also build partial trees by inspecting live Python objects, making it useful for both static analysis of source files and runtime introspection.
Use it for
- Power static analysis and linting tools that need to understand code semantics beyond raw syntax.
- Perform type inference and name resolution on Python source code for code-quality checks.
- Build code analysis plugins that need to reason about variable scope and definition chains.
- Analyze Python codebases programmatically to extract semantic information for documentation or refactoring tools.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Astroid is a mature, actively maintained library with no known vulnerabilities, low install friction, and broad Python version support. The copyleft license requires review if you're building proprietary tools, but it's the standard foundation for Python static analysis. Install it if you're building or extending code-quality tooling.
Install
astroid on PyPI
Before you install
Low friction installation with a single lightweight runtime dependency (typing-extensions). Active maintenance with a release within the past week and regular updates across modern Python versions.
Requires Python 3.10 or later.
License in practice
Licensed under LGPL-2.1-or-later (copyleft). Derivative works and modifications must be distributed under compatible terms; proprietary applications using astroid as a library should review copyleft obligations.
Quickstart
pip install astroid
import astroid
module = astroid.parse('x = 1')
for node in module.nodes_of_class(astroid.Assign):
print(node)Verify before relying
- Whether static inference covers all Python language constructs or has known limitations in specific scenarios.
- Performance characteristics when analyzing large codebases or deeply nested AST structures.
Package facts
| License | LGPL-2.1-or-later copyleft |
| Python support | Supports the current Python release >=3.10.0 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagetyping-extensions |
| Maintenance | Actively maintained 7 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 55,355,505 / month, #537 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 6 - MatureEnvironment :: ConsoleIntended Audience :: DevelopersOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyTopic :: Software Development :: Libraries :: Python ModulesTopic :: Software Development :: Quality AssuranceTopic :: Software Development :: Testing |
Evidence: astroid-4.3.0-py3-none-any.whl
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See also ast-decompiler · asttokens · astatine · jaraco.classes · openqasm3 · pylint · ast-comments · ast-grep-cli · gast · astunparse