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Validate your Python file format with yapf

Project description


Python PyTest CII Best Practices Code style: yapf

Validate your Python file format with yapf.

This is a pytest plugin, which make sure your python file is exactly formatted by yapf, or it will crash when running pytest.


Version Python Format Status Download MIT

pip install pytest-yapf3


  • Python 3.6 or above
  • Pytest:
    • pytest>=5.4,<8 when pytest-yapf3<0.7
    • pytest>=7 when pytest-yapf3>=0.7

If someone use this with Python 3.5 or Pytest less than 5.4, set 'pytest-yapf3<0.6.0'.


Modify setup.cfg (or pytest.ini):

addopts =
yapf-ignore =

Add --yapf to pytest configuration addopts. If run with pytest -m yapf, only yapf is checked.

By default, only line summaries is displayed. With an optional --yapfdiff, a full text of yapf -d is displayed. If not configured here, pytest --yapfdiff will also work.

An optional yapf-ignore is supported. Each line specifies a glob pattern of files which should not check yapf.

The pytest will cache success results of pytest-yapf3, and will not check again if files not changed. Sometimes you may want to disable it. There are 2 ways:

  • pytest -p no:cacheprovider This may crash if any other pytest plugin not supports.
  • rm -rf .pytest_cache/v/yapf This is ugly, but safe for any environment.

Features and Todos

  • Basic support to validate yapf.
  • Fix the diff line count error and improve the performance.
  • Display YAPF-check as the error session name.
  • Display YAPF in pytest --verbose.
  • Add yapf as a marker to enable pytest -m yapf.
  • Support yapf-ignore to ignore specified files.
  • Skip running if a file is not changed.
  • 100% test coverage.


Prepare the environment:

pipenv install --dev
pipenv shell

Run test:



Like black, if your project always pass yapf checking provided by this project, you can use an unofficial badge to show off.

Markdown (

[![Code style: yapf](](

reStructuredText (README.rst)

.. image::
    :alt: Code style: yapf


The MIT License (MIT)

Copyright (c) 2019~2022 Yan QiDong

This repository is forked from pytest-yapf in 2019, which is not maintained since 2017. Besides extra features, the project structure is adjusted, and the code is enhanced to pass linters like flake8, pylint and, of course, yapf.

The 3 in pytest-yapf3 means this package supports Python 3 only.

Change Log

Release 0.7.0

  • Set pytest limit to >=7.
  • Fix a pytest warning with from_parent.

Release 0.6.2

  • Set pytest limit to >=5.4,<8.
  • Upgrade dependencies in Pipfile and its lock.
  • Enable GitHub actions.
  • Delete .travis.yml and .appveyor.yml

Release 0.6.1

  • Fix cache missing.

Release 0.6.0

  • Upgrade pytest to 5.4+, fix a warning.
  • Support python 3.6+ only, abandon 3.5
  • Use Pipfile with pipenv

Release 0.5.1

  • Fix coverage missing lines.
  • 100% test coverage.
  • Fix a crash when yapf crash.
  • Change development status to stable.

Release 0.5.0

  • Skip running if a file is not changed.
  • Add more usage description in README.

Release 0.4.0

  • Add yapf as a pytest marker to enable pytest -m yapf
  • Support yapf-ignore to ignore specified files
  • Fix a probabilistic issue caused by \r

Release 0.3.0

  • Display YAPF-check as the error session name
  • Display ::YAPF in pytest --verbose

Release 0.2.0

Since forked from pytest-yapf 0.1.1, there are some improvements:

  • Restructure the project and rewrite documents
  • Support Python 3.4+ only
  • Add linters to pytest, and fix their errors
  • Fix the line count error
  • Change build configurations in Travis and AppVeyor
  • Support coverage and displayed in codecov

Project details

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