Flask hello world

app.py

import sys

from flask import Flask
app = Flask(__name__)

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

if __name__ == "__main__":
    try:
        port = int(sys.argv[1])
    except:
        print "No port specified, reverting to 8888"
        port = 8888
    app.run(port=port)