Execute at flask initialization

test.py

"""
one way to excute something after app.run:
build another app!
From
http://librelist.com/browser/flask/2012/6/7/execute-at-flask-initialization/#a0b5c59832f372f69be6f6e2af4ae4f9
"""

from flask import Flask
import webbrowser

def create_app():
    app = Flask(__name__)
    def run_on_start(*args, **argv):
        url = "http://127.0.0.1:5000"
        webbrowser.open(url,new=2)
        print "opening the webbrowser"
    run_on_start()
    return app
app = create_app()

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

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