everett
Configuration library for Python applications
Decision gist · record as of 2026-08-14
No—not for new projects. Everett is deprecated and archived as of 2025-10-15, with no further maintenance planned. While it is stable and has no known vulnerabilities, the lack of ongoing support means compatibility issues with future Python versions will not be addressed. Existing projects using it can continue, but new development should choose an actively maintained alternative.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Optional dependencies (configparser for INI, pyyaml for YAML) needed only if using those formats.
- Installation is straightforward with no runtime dependencies for basic use.
License · maintenance · safety
MPLv2 (copyleft) — Everett is licensed under MPL v2, a copyleft license requiring derivative works to disclose source code changes under the same license. This is permissive for use but imposes obligations if you modify and distribute the library.
last release 2025-10-15 (303 days) · last repo commit 2025-10-15 · 148 stars · archived
0 known vulnerabilities (OSV.dev, 2026-08-14) · 706,866 downloads/mo, #5,268 on PyPI
Alternatives
Verify before relying
pip install everett
from everett.manager import ConfigManager
config = ConfigManager.basic_config()
host = config("host", default="localhost")
port = config("port", default="8000", parser=int)- Whether the abandoned status and archived repository will affect long-term compatibility with future Python releases beyond 3.14.
- Whether existing users have migrated to alternative maintained configuration libraries and what the migration path looks like.
What it is and what it does
Everett is a configuration library designed to centralize how Python applications read and validate settings from multiple sources—environment variables, .env files, INI, YAML, and custom sources. It handles type conversion (bool, int, lists, classes), provides clear error messages when configuration is invalid, and includes a Sphinx extension for auto-generating configuration documentation. The library is built around the 12-Factor app pattern and supports component-based architectures with namespaced configuration keys.
The package is now deprecated and its repository is archived as of October 2025. While it remains functional for existing projects, no new features or maintenance will be provided. It is suitable for applications already using it or for new projects that do not require ongoing vendor support, but teams starting fresh should evaluate actively maintained alternatives.
Use it for
- Building 12-factor web applications that read configuration from environment variables and .env files during development and deployment.
- Testing application behavior under different configuration scenarios using config_override context manager to inject test values.
- Generating configuration documentation automatically for end users via Sphinx directives without manual duplication.
- Managing multi-component applications where different modules need namespaced configuration keys and isolated settings.
- Parsing and validating typed configuration values (booleans, integers, lists) with helpful error messages when users provide invalid input.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
No—not for new projects.
Everett is deprecated and archived as of 2025-10-15, with no further maintenance planned. While it is stable and has no known vulnerabilities, the lack of ongoing support means compatibility issues with future Python versions will not be addressed. Existing projects using it can continue, but new development should choose an actively maintained alternative.
Install
everett on PyPI
Before you install
Installation is straightforward with no runtime dependencies for basic use. However, the project is marked deprecated as of 2025-10-15 and the repository is archived, meaning no further maintenance or updates will occur.
Requires Python 3.10 or later. Optional dependencies (configparser for INI, pyyaml for YAML) needed only if using those formats.
License in practice
Everett is licensed under MPL v2, a copyleft license requiring derivative works to disclose source code changes under the same license. This is permissive for use but imposes obligations if you modify and distribute the library.
Quickstart
pip install everett
from everett.manager import ConfigManager
config = ConfigManager.basic_config()
host = config("host", default="localhost")
port = config("port", default="8000", parser=int)Verify before relying
- Whether the abandoned status and archived repository will affect long-term compatibility with future Python releases beyond 3.14.
- Whether existing users have migrated to alternative maintained configuration libraries and what the migration path looks like.
Package facts
| License | MPLv2 copyleft |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Abandoned 303 days since the last release |
| Last repo commit | repository archived |
| First released | |
| Downloads | 706,866 / month, #5,268 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: DevelopersLicense :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)Natural Language :: EnglishProgramming 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 :: CPythonTopic :: Software Development :: Libraries :: Python Modules |
Evidence: everett-3.5.0-py3-none-any.whl
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