apply pyupgrade

examples/javascript/js_example/__init__.py

@@ -2,4 +2,4 @@ from flask import Flask
 
 app = Flask(__name__)
 
-from js_example import views
+from js_example import views  # noqa: F401

examples/javascript/js_example/views.py

@@ -8,7 +8,7 @@ from js_example import app
 @app.route("/", defaults={"js": "plain"})
 @app.route("/<any(plain, jquery, fetch):js>")
 def index(js):
-    return render_template("{0}.html".format(js), js=js)
+    return render_template(f"{js}.html", js=js)
 
 
 @app.route("/add", methods=["POST"])

examples/javascript/setup.py

@@ -1,9 +1,7 @@
-import io
-
 from setuptools import find_packages
 from setuptools import setup
 
-with io.open("README.rst", "rt", encoding="utf8") as f:
+with open("README.rst", encoding="utf8") as f:
     readme = f.read()
 
 setup(

examples/tutorial/flaskr/auth.py

@@ -64,7 +64,7 @@ def register():
             db.execute("SELECT id FROM user WHERE username = ?", (username,)).fetchone()
             is not None
         ):
-            error = "User {0} is already registered.".format(username)
+            error = f"User {username} is already registered."
 
         if error is None:
             # the name is available, store it in the database and go to

examples/tutorial/flaskr/blog.py

@@ -49,7 +49,7 @@ def get_post(id, check_author=True):
     )
 
     if post is None:
-        abort(404, "Post id {0} doesn't exist.".format(id))
+        abort(404, f"Post id {id} doesn't exist.")
 
     if check_author and post["author_id"] != g.user["id"]:
         abort(403)

examples/tutorial/setup.py

@@ -1,9 +1,7 @@
-import io
-
 from setuptools import find_packages
 from setuptools import setup
 
-with io.open("README.rst", "rt", encoding="utf8") as f:
+with open("README.rst", encoding="utf8") as f:
     readme = f.read()
 
 setup(

examples/tutorial/tests/conftest.py

@@ -44,7 +44,7 @@ def runner(app):
     return app.test_cli_runner()
 
 
-class AuthActions(object):
+class AuthActions:
     def __init__(self, client):
         self._client = client
 

examples/tutorial/tests/test_db.py

@@ -17,7 +17,7 @@ def test_get_close_db(app):
 
 
 def test_init_db_command(runner, monkeypatch):
-    class Recorder(object):
+    class Recorder:
         called = False
 
     def fake_init_db():