misc: add isort (#58937)

.git-blame-ignore-revs

@@ -2,3 +2,5 @@
 caa40e7e771b41bd1d164341a2e7f40689cbe4ba
 # trivial: apply black (#58937)
 3ee72e5336d03526c7ab297a5cf09057a6d5d1c2
+# trivial: apply isort (#58937)
+8bf4ab81c5483af946365645d15708796c832d7e

.pre-commit-config.yaml

@@ -6,6 +6,11 @@ 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:

README.txt

@@ -187,13 +187,17 @@ black is used to format the code, using thoses parameters:
 
     black --target-version py35 --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 pyupgrade
-before commits. (execute `pre-commit install` to install the git hook.)
+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.)
+
+
+