Flask 3.0: Type Hints and importlib

Overview

Flask 3.0, released on October 1, 2023, drops Python 3.7, adds native type hints and migrates to importlib for resource loading.

Main Features

Type annotations now cover the entire public API. Replacing pkg_resources with importlib.metadata improves startup times.

from flask import Flask

app = Flask(__name__)

@app.route('/')
def index() -> str:
    return '<h1>Flask 3.0</h1>'

Sources

• Flask 3.0 Changelog