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(