pre-commit: add autoflake and isort, include autoformatter config

.pre-commit-config.yaml

@@ -20,6 +20,21 @@ repos:
         # exclude it from the pyupgrade hook that will apply f-strings etc.
         exclude: bootstrap/bootstrap.py
 
+  # Autoformat: Python code
+  - repo: https://github.com/PyCQA/autoflake
+    rev: v2.1.1
+    hooks:
+      - id: autoflake
+        # args ref: https://github.com/PyCQA/autoflake#advanced-usage
+        args:
+          - --in-place
+
+  # Autoformat: Python code
+  - repo: https://github.com/pycqa/isort
+    rev: 5.12.0
+    hooks:
+      - id: isort
+
   # Autoformat: Python code
   - repo: https://github.com/psf/black
     rev: 23.3.0

pyproject.toml

@@ -0,0 +1,34 @@
+# autoflake is used for autoformatting Python code
+#
+# ref: https://github.com/PyCQA/autoflake#readme
+#
+[tool.autoflake]
+ignore-init-module-imports = true
+remove-all-unused-imports = true
+remove-duplicate-keys = true
+remove-unused-variables = true
+
+
+# isort is used for autoformatting Python code
+#
+# ref: https://pycqa.github.io/isort/
+#
+[tool.isort]
+profile = "black"
+
+
+# black is used for autoformatting Python code
+#
+# ref: https://black.readthedocs.io/en/stable/
+#
+[tool.black]
+# target-version should be all supported versions, see
+# https://github.com/psf/black/issues/751#issuecomment-473066811
+target_version = [
+    "py36",
+    "py37",
+    "py38",
+    "py39",
+    "py310",
+    "py311",
+]