Good defaults for a Python project: Poetry + pre-commit + black + flakehell + isort

.pre-commit-config.yaml

repos:
- repo: local
  hooks:
  - id: black
    name: black
    entry: black
    language: system
    types: [python]
- repo: local
  hooks:
  - id: flakehell
    name: flakehell
    entry: flake8helled
    language: system
    types: [python]
- repo: local
  hooks:
  - id: isort
    name: isort
    entry: isort
    language: system
    types: [python]

pyproject.toml

# [...]

[tool.poetry.dev-dependencies]
pre-commit = "^2.12.0"
pytest = "^6.2.3"
black = "^20.8b1"
flakehell = "^0.9.0"
isort = "^5.8.0"

[tool.flakehell]
# https://flakehell.readthedocs.io/
# https://black.readthedocs.io/en/stable/compatible_configs.html?highlight=flake8#flake8
max-line-length = 88
extend-ignore = "E203, W503"
# https://github.com/flakehell/flakehell/issues/10#issuecomment-822720074
extended_default_ignore = []  # add this

[tool.isort]
# https://pycqa.github.io/isort/docs/configuration/black_compatibility/
profile = "black"