autoflake, isort, black and flake8 pre-commits

.pre-commit-config.yaml

repos:
  - repo: local
    hooks:
    - id: autoflake
      name: Remove unused variables and imports
      entry: bash -c 'autoflake "$@"; git add -u' -- # This runs autoflake and stages the reformatted python files before running autoflake again, which should then "pass"
      language: python
      args: ["--in-place", "--remove-all-unused-imports", "--remove-unused-variables", "--expand-star-imports", "--ignore-init-module-imports"]
      files: \.py$
    - id: isort
      name: Sorting import statements
      entry: bash -c 'isort "$@"; git add -u' --
      language: python
      args: ["--filter-files"]
      files: \.py$
    - id: black
      name: Black Python code formatting
      entry: bash -c 'black "$@"; git add -u' --
      language: python
      types: [python]
      language_version: python3.7
      args: ["--line-length=120"]