pyproject-flake8 (pflake8)

A monkey patching wrapper to connect flake8 with pyproject.toml configuration.

Update concerning versioning:

pyproject-flake8 so far came without explicit pinning of a flake8 version. Since a recent update broke compatibility – not unexpectedly – the issue arose, how to handle incompatible versions of flake8 and pyproject-flake8. Since there are good reasons for and against version pinning, this project now tries to follow a mix of both: Release versions will follow and pin identical flake8 versions, alpha versions (specific to pyproject-flake8) will pin to the similar non-alpha version of flake8, or later. That way, users of pyproject-flake8 can decide, whether they want a fixed version known to work, or a minimum version, getting later versions, at the risk of future breakage.

Versions 0.0.1x are pyproject-flake8 internal versions and do not correspond to flake8. Furthermore, flake8 3.8.0 was chosen as the first flake8 version to mirror this way.

tl;dr:

# e.g., suggested installation / dependency ... depending on flake8==5.0.4

# for Python 3.8+
pip install pyproject-flake8==5.0.4

# for Python 3.6+
pip install pyproject-flake8==5.0.4.post1

Rationale

flake8 is one of the most popular Python linters, pyproject.toml has become the standard for Python project metadata.

More and more tools are able to utilize a shared pyproject.toml, alleviating the need for many individual configuration files cluttering a project repository.

Since excellent flake8 is not aimed to support pyproject.toml, this wrapper script tries to fix the situation.

Installation

From github

pip install .

From PyPI

pip install pyproject-flake8

Building packages

Use your favorite PEP517 compliant builder, e.g.:

# install first via: pip install build
python -m build
# packages will reside in dist/

Usage

Call pflake8 instead of flake8.

Configuration goes into the tool.flake8 section of pyproject.toml:

[tool.flake8]
max-line-length = 88
extend-ignore = ["E203"]
max-complexity = 10

See also

Two other projects aim to address the same problem:

• flake9
• FlakeHell

Both seem to try to do a lot more than just getting pyproject.toml support. pyproject-flake8 tries to stay minimal while solving its task.

flake8-pyproject adds only pyproject.toml support, and does this as a Flake8 plugin, allowing the original flake8 command to work (rather than using pflake8).

Caveat

This script monkey-patches flake8 and the configparser library of Python, therefore loading it as a module may have unforeseen consequences. Alpha quality. Use at your own risk. It will likely break if either Python or flake8 restructure their code significantly. No guarantees for stability between versions.

License

Unlicense