Configuration files to enable validating python code with flake8, mypy, isort, and black using pre-commit hooks (via https://pre-commit.com/). Also an .editorconfig file for standardization across editors.

.editorconfig

# http://editorconfig.org/#file-format-details
root = true

[*]
charset = utf-8
end_of_line = lf
indent_size = 4
indent_style = space
insert_final_newline = true
trim_trailing_whitespace = true

[*.md]
trim_trailing_whitespace = false

[Makefile]
indent_style = tab

.flake8

[flake8]
max-line-length = 88
select =
    E # pep8 errors
    F # pyflakes errors
    W # pep8 warnings
    B # flake8-bugbear warnings
ignore =
    E501 # "Line lengths are recommended to be no greater than 79 characters"
    E203 # "Whitespace before ':'": conflicts with black
    W503 # "line break before binary operator": conflicts with black
exclude =
    .git
    .vscode
    .pytest_cache
    .bamboo
    .mypy_cache
    .venv
    .env
    .direnv
per-file-ignores =
    __init__.py:F401

.pre-commit-config.yaml

exclude: docs
repos:
-   repo: https://gitlab.com/pycqa/flake8
    rev: "3.8.3"
    hooks:
    - id: flake8
      additional_dependencies:
        - flake8-bugbear
-   repo: https://github.com/psf/black
    rev: "20.8b1"
    hooks:
    - id: black
      args:
        - --check
-   repo: https://github.com/PyCQA/isort
    rev: '5.5.3'  # Use the revision sha / tag you want to point at
    hooks:
    -   id: isort
        args:
          - --check
-   repo: https://github.com/pre-commit/mirrors-mypy
    rev: 'v0.910'
    hooks:
    -   id: mypy
        args:
          - --ignore-missing-imports
          - --follow-imports=silent
          - --install-types
          - --non-interactive
- repo: https://github.com/adrienverge/yamllint.git
  rev: v1.26.1
  hooks:
    - id: yamllint
      args: ["--config-file",  ".yamllint.yaml"]

.yamllint.yaml

---
extends: relaxed

rules:
  line-length: disable

pyproject.toml

[tool.isort]
line_length = 88
profile = "black"
skip = ["./.venv", "./direnv", ".env"]

[tool.black]
exclude = '''
(
  /(
      \.vscode
    | \.git
    | \.pytest_cache
    | \.mypy_cache
    | \.venv
    | \.env
    | \.direnv
  )/
)
'''
include = '\.pyi?$'
line-length = 88

[tool.pytest.ini_options]
testpaths = ["tests"]

[tool.mypy]
files = [
  "src/**/*.py",
  "tests/**/*.py",
]
follow_imports = "silent"
ignore_missing_imports = true
scripts_are_modules = true