What's the right approach for calling functions after a flask app is run?

Question

I\'m a little confused about how to do something that I thought would be quite simple. I have a simple app written using Flask. It looks something like this:

Answer 1

from flask import Flask

def create_app():
    app = Flask(__name__)
    def run_on_start(*args, **argv):
        print "function before start"
    run_on_start()
    return app

app = create_app()

@app.route("/")
def hello():
    return "Hello World!"