Welcome to Instant Flask Web Development. We will progressively walk through web development in the Python programming language using Flask, a small but expressive framework which provides the essentials and enables you to build your own code patterns. We will build a simple scheduling application to keep track of appointments, including a database and a user interface, and we will build one piece at a time. We will build our application bottom-up, and you will see how everything fits together in later sections. This bottom-up a pproach will give you the building blocks you need to grow your project with Flask