Flake8-pyproject

What it is and what it does

Flake8-pyproject is a Flake8 plugin that solves a long-standing gap: Flake8 has resisted native pyproject.toml support despite most Python dev tools adopting it as the standard configuration location. This plugin registers itself with Flake8 to automatically load configuration from a [tool.flake8] section in pyproject.toml, allowing you to consolidate your project's tool configuration in one place.

The plugin works by converting your existing Flake8 configuration (whether from .flake8, setup.cfg, or tox.ini) into TOML format and placing it under [tool.flake8] in pyproject.toml. When you run flake8, the plugin intercepts the startup and loads that configuration transparently. It also provides a flake8p command as a fallback for compatibility or reliability reasons.

Use it for:

• Consolidate all Python tool configuration (pytest, black, isort, flake8) into a single pyproject.toml file.
• Migrate from setup.cfg or .flake8 to a modern, unified project configuration structure.
• Simplify project setup for teams that expect all linting config in pyproject.toml.
• Avoid maintaining multiple configuration files when pyproject.toml is already the standard in your codebase.

Worth the install?

AI-flagged interpretation of the facts on this page — verify before relying

Flake8-pyproject enables Flake8 to read its configuration from pyproject.toml instead of requiring separate .flake8, setup.cfg, or tox.ini files.

Yes. If you want Flake8 configuration in pyproject.toml, this is the only practical way to get it. Low install friction, active maintenance, no vulnerabilities, and permissive licensing make it a straightforward addition. Install it if your project has already standardized on pyproject.toml for other tools.

Install

flake8-pyproject on PyPI

pip install flake8-pyproject

uv add flake8-pyproject

poetry add flake8-pyproject

Installing Flake8-pyproject

Before you install

Low friction: pure Python wheel with only two runtime dependencies (Flake8 and TOMLi). Active maintenance with a recent release (2025-11-28) and no known vulnerabilities.

License in practice

MIT license (permissive) places no restrictions on use, modification, or distribution.

Quickstart

pip install flake8-pyproject

# Add [tool.flake8] section to pyproject.toml:
# [tool.flake8]
# ignore = ['E231', 'E241']
# max-line-length = 88

flake8 .

Verify before relying

• Whether the plugin works reliably with all Flake8 versions or if there are known incompatibilities.
• Performance impact when loading configuration from pyproject.toml versus traditional config files.

Package facts

Evidence: flake8_pyproject-1.2.4-py3-none-any.whl

Keywords: Flake8, pyproject.toml

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