start up with python run.py and you can access

I"ll try to run the simplest HelloWorld 404.Do you know anything about it?

gunicorn -b :5000 run:app

HelloWorld is like this

app/
    __init__.py
    views.py
run.py

_ _ init__.py

from flask import Flask
app = Flask(__name__)
from app import views

views.py

from app import app
@app.route("/")
def index()
    return "hello world"

run.py

from app import app

if __name__ == "__main__":
    app.run(host="0.0.0.0")