---
title: "How python tools configure"
description: "Mypy's config parser seems to be one of the most complex. This is likely in part to it having the largest backwards compatability of all projects that I..."
date: 2020-07-21
published: true
tags:
  - python
template: blog-post
---


## mypy

Mypy's config parser seems to be one of the most complex.  This is likely in part to it having the largest backwards compatability of all projects that I looked at.

[mypy/config_parser](https://github.com/python/mypy/blob/master/mypy/config_parser.py)


## flake8



[options/config.py](https://github.com/PyCQA/flake8/blob/master/src/flake8/options/config.py)

## black

[black](https://github.com/psf/black/blob/master/src/black/__init__.py#L277-L331)

## portray

* only uses pyproject.toml

[portray/config.py](https://github.com/timothycrosley/portray/blob/main/portray/config.py)

## interrogate

* only uses pyproject.toml