After having gone through this chapter and building the Snap application, we have seen several facets of how Flask may be augmented with the use of extensions, such as Flask-WTF (for web form creation and validation), Flask-SQLAlchemy (for simple integration with the SQLAlchemy database abstraction library), Flask-Bcrypt (for password hashing), and Flask-Login (to abstract much of the standard implementation requirements for a simple user login system). While Flask itself is relatively spartan, the ecology of extensions that are available make it such that building a fully fledged user-authenticated application may be done quickly and relatively painlessly.

We explored the aforementioned extensions and their usefulness, including Flask-WTF and Flask-SQLAlchemy, and architected a simple blueprint-based application that integrated all of the above components. While the Snap application itself is quite simple and leaves much to be implemented, it lends itself very easily to updates and...