Quart

Quart is a fast ASGI web application framework. It is the async version of Flask, providing the same developer API and a similar extension ecosystem. It also provides additional ASGI features such as handling WebSocket routes and better concurrent streaming request/response performance.

# hello.py
from quart import Quart

app = Quart(__name__)

@app.route('/')
async def greet():
    return 'Hello, World!'

$ export QUART_APP=hello:app
$ quart run