Add pre-commit hooks

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/pre-commit/mirrors-isort
+    rev: v5.7.0  # https://github.com/pre-commit/mirrors-isort/tags
+    hooks:
+      - id: isort
+
+  - repo: https://github.com/psf/black
+    rev: 20.8b1  #  https://github.com/psf/black/tags
+    hooks:
+      - id: black
+
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.9.0  # https://gitlab.com/pycqa/flake8/-/tags
+    hooks:
+    -   id: flake8
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.812  # https://github.com/pre-commit/mirrors-mypy/tags
+    hooks:
+      - id: mypy
+        exclude: 'docs'
+
+  - repo: https://github.com/asottile/add-trailing-comma
+    rev: v2.1.0  # https://github.com/asottile/add-trailing-comma/tags
+    hooks:
+      - id: add-trailing-comma
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.4.0  # https://github.com/pre-commit/pre-commit-hooks/tags
+    hooks:
+      - id: check-json
+      - id: check-xml
+      - id: check-yaml
+      - id: debug-statements
+      - id: requirements-txt-fixer

pyproject.toml

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+[tool.isort]
+profile = "hug"
+force_single_line = true
+
+[tool.black]
+# line-length = 88  # default. adapt if necessary, must be in sync with flake8 config
+exclude = '''
+(
+  /(
+    | \.git          # root of the project
+    | \venv*
+    | nucleo*
+  )/
+)
+'''

setup.cfg

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+[tool:pytest]
+pep8ignore = E501
+
+[flake8]
+# ignore errors and warnings
+# - whitespace before ':', see https://github.com/psf/black/issues/315
+# - line break before binary operator, see https://github.com/psf/black/issues/52
+ignore = E203, W503
+
+# must be in sync with 'black' formatter config in pyproject.toml
+max-line-length = 88
+
+[mypy]
+ignore_missing_imports  = True
+exclude=docs/