Flask is a micro web framework written in Python. It has no database abstraction layer, form validation, or any other components where pre-existing third-party libraries provide common functions. However, Flask supports extensions that can add application features as if they were implemented in Flask itself. Extensions exist for object-relational mappers, form validation, upload handling, various open authentication technologies and several common framework related tools. Extensions are updated far more frequently than the core Flask program.
pip install flask
How flask blueprints work⚑
A blueprint is an object that defines a collection of views, templates, static files and other elements that can be applied to an application. The killer use-case for blueprints is to organize our application into distinct components. However, a Flask Blueprint needs to be registered in an application before you can run it. Once it's done, it extends the application with the contents of the Blueprint.