Python web app development has a frameworks in which we can develop our web app.
There are several python frameworks like Flask,Django,Tornado,pyramid,etc.
To install Flask framework on a Ubuntu there are several Commands to be run on Terminal.
1.pip install flask
4.create new seperate directory for your new flask app:-mkdir Flask_Blog
After running these 6 command you will see a localhost address as 127.0.0.1:5000
To set the debugger pin, run command FLASK_DEBUG=1
copy these address and paste it in your browser.You will see a Hello world Program on your screen.