misc: add pyugrade files/notes (#69708)

.git-blame-ignore-revs

@@ -2,3 +2,5 @@
 872f39774a43db59ffc4bbddc77ad3a33ba7ead2
 # misc: apply black 22.1.0
 f014f154640dc30fd27662ec6d93ae6e64125ea3
+# misc: apply pyupgrade (#69708)
+a107b7ef0e847882dcd6d5fc8c39e8feccc5705e

.pre-commit-config.yaml

@@ -1,6 +1,11 @@
 # See https://pre-commit.com for more information
 # See https://pre-commit.com/hooks.html for more hooks
 repos:
+-   repo: https://github.com/asottile/pyupgrade
+    rev: v2.20.0
+    hooks:
+    - id: pyupgrade
+      args: ['--keep-percent-format', '--py37-plus']
 -   repo: https://github.com/psf/black
     rev: 22.3.0
     hooks:

README

@@ -184,7 +184,11 @@ isort is used to format the imports, using those parameters:
 
     isort --profile black --line-length 110
 
-There is .pre-commit-config.yaml to use pre-commit to automatically run black and isort
+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 these tools
 before commits. (execute `pre-commit install` to install the git hook.)