Scaffolding

While implementing any project from scratch, you are free to design the scaffolding of your project. We are going to follow the scaffolding shown in the following screenshot:

Let's look at each directory and its uses in detail:

• .env: This is our virtualenv directory, which has been created by the virtualenv command.
• auth: We are going to create a standalone generic authentication module using the Flask-Login and Flask-SqlAlchemy extensions.
• config: Here, we are going to create some configuration and generic database models, which may be needed by other modules.
• static: It's Flask standard practice to put the static content under the static directory. Hence, we will be using this directory for all required static content.
• templates: Flask has built-in support for the Jinja2 template engine and follows the standard layout for the template files based on the modules' names. We will see a detailed description of this later, when we actually utilize the templates.
• todo: This is a standalone Flask module or package which has the basic to-do functionality.
• __init__.py: This is Python's standard file that is required under a directory to build a Python package. We are going to write code here to configure our application.
• migrations: This directory is autogenerated by Flask-Migrate. In a future section, we will see how Flask-Migrate works.
• .gitignore: This contains a list of files and directories that should be ignored by Git versioning.
• LICENSE: I have created a Git repository using GitHub and included an MIT license for our flask_todo repository.
• README.md: This file is used to describe information about the repository on GitHub.
• requirements.txt: This is the file where we listed all the required packages mentioned in the preceding section.
• run.py: Here, we are going to create the final instance of our Flask application.
• zappa_settings.json: This file gets generated by Zappa and has Zappa-related configurations.

We will look at a detailed explanation of the code in the upcoming sections.