build: document and use isort and pyupgrade

.git-blame-ignore-revs

@@ -1,2 +1,4 @@
 # trivial: apply black
 ce7f2dd5000cf1eb462ae18aeeb5ab66913b452f
+# trivial: apply isort & pyupgrade
+250ef2e74ae674f7039318787ba85b63f2825c7d

.pre-commit-config.yaml

@@ -6,3 +6,13 @@ repos:
     hooks:
     - id: black
       args: ['--target-version', 'py37', '--skip-string-normalization', '--line-length', '110']
+-   repo: https://github.com/PyCQA/isort
+    rev: 5.7.0
+    hooks:
+    - id: isort
+      args: ['--profile', 'black', '--line-length', '110']
+-   repo: https://github.com/asottile/pyupgrade
+    rev: v2.20.0
+    hooks:
+    - id: pyupgrade
+      args: ['--keep-percent-format', '--py37-plus']

README

@@ -44,8 +44,17 @@ black is used to format the code, using thoses parameters:
 
     black --target-version py37 --skip-string-normalization --line-length 110
 
-There is .pre-commit-config.yaml to use pre-commit to automatically run black
-before commits. (execute `pre-commit install` to install the git hook.)
+isort is used to format the imports, using those parameters:
+
+    isort --profile black --line-length 110
+
+pyupgrade is used to automatically upgrade syntax, using those parameters:
+
+    pyupgrade --keep-percent-format --py37-plus
+
+There is .pre-commit-config.yaml to use pre-commit to automatically run black,
+isort and pyupgrade before commits. (execute `pre-commit install` to install
+the git hook.)
 
 
 License