Use a Flask Blueprint to Architect Your Applications ...
https://realpython.com/flask-blueprintWhat a Flask Blueprint Looks Like. Flask Blueprints encapsulate functionality, such as views, templates, and other resources.To get a taste for how a Flask Blueprint would work, you can refactor the previous application by moving the index view into a Flask Blueprint. To do so, you have to create a Flask Blueprint that contains the index view and then use it in the application.
blueprint · PyPI
https://pypi.org/project/blueprint05.01.2013 · Feb 23, 2011. Download files. Download the file for your platform. If you're not sure which to choose, learn more about installing packages. Files for blueprint, version 3.4.2. Filename, size. File type. Python version.