---
id: stdlib-list
version: "0.12.0"
license: unclear
license_treatment: permissive
maintenance: active
---

# stdlib-list — A list of Python Standard Libraries (2.7 through 3.14).

License: permissive · Maintenance: active · Downloads: 1.6M/mo

## What it is and what it does

stdlib-list is a reference package that bundles pre-computed lists of standard library module names for multiple Python versions. It lets you query which modules belong to the standard library for a given Python version (2.6 through 3.14), which is useful when you need to distinguish standard library imports from third-party packages in code analysis or dependency detection tasks.

The package is a simple data lookup tool with no external dependencies. However, the description itself notes that for Python 3.10 and newer, the standard library now exposes sys.stdlib_module_names and sys.builtin_module_names, making this package redundant for modern Python versions. It remains relevant for projects that must support older Python versions or need a unified interface across multiple versions.

Use it for:

- Detect whether an imported module is part of the standard library or a third-party package during static analysis.
- Build tools or linters that need to categorize imports by source across multiple Python versions.
- Legacy Python 2.7 or early Python 3 projects that need stdlib membership data without relying on runtime introspection.

## Worth the install?

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

Provides lists of Python standard library module names for Python versions 2.6 through 3.14, useful for distinguishing standard library imports from third-party packages.

Yes, if you support Python versions older than 3.10 and need to programmatically check stdlib membership. No, if you target only Python 3.10 or newer — use sys.stdlib_module_names instead. The package is well-maintained, has no security issues, and installs with zero friction, but its utility is narrowing as Python versions advance.

## Install

pip install stdlib-list
uv add stdlib-list
poetry add stdlib-list

## Installing stdlib-list

Before you install: Low friction: pure Python wheel with no runtime dependencies. Actively maintained as of 2025-10-24 with recent commits; repository is not archived.

License in practice: MIT license (permissive) — you can use, modify, and distribute this package freely in commercial and private projects with minimal restrictions.

Quickstart:

from stdlib_list import stdlib_list
libraries = stdlib_list("3.9")
print(libraries)

Requires Python 3.9 or newer; for Python 3.10 and newer, consider using sys.stdlib_module_names instead (built into the standard library).

Verify before relying:

- Whether the library's data for Python 3.11–3.14 is complete and accurate relative to those Python releases.
- Performance characteristics when querying large version ranges or calling the function repeatedly.

## Package facts

- License: not declared (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 1.6M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

python standard library list, stdlib module names, check if module is builtin, standard library detection, python version stdlib, builtin modules list, introspection, legacy-python

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