flask

from flask import Flask

app=Flask(__name__)

@app.route("/")

def hello():

        return "Hello World"

if __name__=='__main__':

        app.run(debug=True, host='0.0.0.0', port=8081)  #default host is 127.0.0.1 and port 5000(if not provided).

python app.py #This starts webapp at port 8081.