feu
A lightweight Python library for managing packages and versions across different Python environments
Decision gist · record as of 2026-08-14
Yes, if you need to manage package versions across multiple Python environments or automate version compatibility checks. The low install friction, active maintenance, permissive license, and zero known vulnerabilities make it a safe choice. Start with the basic import/version-check functions; the CLI and GitHub utilities are optional. Not necessary if you only target a single Python version or manually manage dependencies.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low install friction with only packaging and tomli as runtime dependencies.
- Active maintenance with a release 4 days ago; repository shows recent activity.
License · maintenance · safety
BSD-3-Clause (permissive) — BSD-3-Clause is permissive; you can use, modify, and distribute feu with minimal restrictions, provided you include the license notice.
last release 2026-08-10 (4 days) · last repo commit 2026-08-14 · 1 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 938,001 downloads/mo, #4,688 on PyPI
Alternatives
Verify before relying
pip install feu
from feu.imports import is_package_available
from feu.compat import Target, find_closest_version
if is_package_available("numpy"):
version = find_closest_version(
pkg_name="numpy", pkg_version="2.0.2", target=Target(python_version="3.10")
)
print(f"Closest valid version: {version}")- Whether built-in registry covers the packages you need or if PyPI fallback is reliable for your use case.
- Performance characteristics when querying PyPI for version compatibility on large package lists.
- Accuracy of version compatibility predictions across different OS and CPU architectures.
What it is and what it does
feu is a lightweight library that automates Python package version management across different Python environments. It solves the problem of manually tracking which package versions work with which Python versions by providing tools to check package availability, discover compatible versions from PyPI, and validate versions before installation. The core functionality depends only on packaging, with optional dependencies for CLI tools and GitHub integration.
Typically used when you need to support multiple Python versions in a project or when deploying code to environments with different Python versions and package availability. It includes a built-in registry of compatibility information for popular packages like numpy, pandas, and torch, and falls back to PyPI discovery for packages not in the registry.
Use it for
- Verify if a package is installed and get its version before attempting to use it in your code.
- Find the closest compatible version of a package for a specific Python version before installation.
- Automate version selection in CI/CD pipelines to prevent installation failures across multiple Python versions.
- Build tools that need to discover and install packages with automatic version compatibility checks.
- Support multi-version Python projects by querying compatibility across different target environments.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need to manage package versions across multiple Python environments or automate version compatibility checks.
The low install friction, active maintenance, permissive license, and zero known vulnerabilities make it a safe choice. Start with the basic import/version-check functions; the CLI and GitHub utilities are optional. Not necessary if you only target a single Python version or manually manage dependencies.
Install
feu on PyPI
Before you install
Low install friction with only packaging and tomli as runtime dependencies. Active maintenance with a release 4 days ago; repository shows recent activity.
Requires Python 3.10 or later.
License in practice
BSD-3-Clause is permissive; you can use, modify, and distribute feu with minimal restrictions, provided you include the license notice.
Quickstart
pip install feu
from feu.imports import is_package_available
from feu.compat import Target, find_closest_version
if is_package_available("numpy"):
version = find_closest_version(
pkg_name="numpy", pkg_version="2.0.2", target=Target(python_version="3.10")
)
print(f"Closest valid version: {version}")Verify before relying
- Whether built-in registry covers the packages you need or if PyPI fallback is reliable for your use case.
- Performance characteristics when querying PyPI for version compatibility on large package lists.
- Accuracy of version compatibility predictions across different OS and CPU architectures.
Package facts
| License | BSD-3-Clause permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 2 packagespackagingtomli |
| Maintenance | Actively maintained 4 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 938,001 / month, #4,688 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersIntended Audience :: Information TechnologyIntended Audience :: Science/ResearchLicense :: OSI Approved :: BSD LicenseOperating System :: MacOSOperating System :: POSIX :: LinuxProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: Scientific/EngineeringTopic :: Software Development :: LibrariesTopic :: Software Development :: Libraries :: Python ModulesTopic :: System :: Installation/SetupTopic :: System :: Software DistributionTopic :: Utilities |
Evidence: feu-0.8.1-py3-none-any.whl
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