Flask is the backend stuff ,I prefer the most.
What is Flask ?
Flask is a web application framework written in Python. Armin Ronacher, who leads an international group of Python enthusiasts named Pocco, develops it. Flask is based on Werkzeug WSGI toolkit and Jinja2 template engine. Both are Pocco projects.
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a very detail about flask can be found here opensource.com/article/18/4/flask