Flask project structure conventions - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the app.py file in a Flask project?

The app.py file is the main entry point of a Flask application. It creates the Flask app instance and defines routes and configurations.

beginner

Why do Flask projects often have a templates folder?

The templates folder stores HTML files that Flask uses to render web pages dynamically using the Jinja2 template engine.

beginner

What is the role of the static folder in a Flask project?

The static folder holds static files like CSS, JavaScript, and images that the browser can load directly without processing.

intermediate

Why might a Flask project use a config.py file?

A config.py file stores configuration settings like secret keys, database URLs, and debug mode, keeping them separate from the main code.

intermediate

What is the benefit of organizing Flask code into a package (a folder with __init__.py) instead of a single file?

Using a package allows splitting code into modules for routes, models, and helpers. This keeps the project clean, easier to maintain, and scalable.

Which folder in a Flask project contains HTML templates?

A static

B app

C config

D templates

The templates folder holds HTML files used by Flask to render pages.

Where should you put CSS and JavaScript files in a Flask project?

A templates

B config

C static

D app.py

Static files like CSS and JavaScript go into the static folder.

What is the main purpose of app.py in Flask?

A Define routes and create the app instance

B Store CSS files

C Hold HTML templates

D Configure database migrations

app.py is where you create the Flask app and define routes.

Why use a config.py file in a Flask project?

A To keep configuration settings separate

B To store static images

C To write HTML templates

D To define URL routes

config.py keeps settings like secret keys and database URLs organized.

What does adding an __init__.py file to a folder do in a Flask project?

A Adds CSS styles

B Makes the folder a Python package

C Creates a static folder

D Deletes the folder

An __init__.py file makes the folder a Python package, allowing modular code.

Describe the typical folder structure of a Flask project and the purpose of each main folder or file.

Think about where you put your HTML, styles, and main code.

Explain why organizing Flask code into packages and separate files is helpful as a project grows.

Compare a messy desk to a tidy one with labeled drawers.