misc: add isort files/notes (#55470)

.git-blame-ignore-revs

@@ -1,2 +1,4 @@
 # trivial: apply black
 2bf37aaa7e459d429fca284f2de60add5841d063
+# trivial: apply isort (#55470)
+0f75316e1b9a70e311d2971e75b32f84b00f487a

.pre-commit-config.yaml

@@ -6,3 +6,8 @@ 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']

README

@@ -15,12 +15,17 @@ Variables
 Code Style
 ----------
 
-black is used to format the Python code, using thoses parameters:
+black is used to format the Python code, using these parameters:
 
     black --target-version py37 --skip-string-normalization --line-length 110
 
+Similarly, isort is used for imports, using these parameters:
+
+    isort --profile black --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.)
+and isort before commits. (execute `pre-commit install` to install the git
+hook.)
 
 
 License