First FastAPI application - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is FastAPI used for?

FastAPI is a modern web framework for building APIs with Python. It helps create fast and easy-to-use web services.

beginner

Which Python package do you import to start a FastAPI app?

You import the FastAPI class from the fastapi package to create your application instance.

beginner

What does the @app.get('/') decorator do in FastAPI?

It tells FastAPI to run the function below it when someone visits the root URL ('/') with a GET request.

beginner

How do you run a FastAPI app locally for testing?

You use the command 'uvicorn main:app --reload' in the terminal, where 'main' is your Python file and 'app' is your FastAPI instance.

beginner

What will this FastAPI function return? @app.get('/') async def root(): return {"message": "Hello, FastAPI!"}

It returns a JSON response with a key 'message' and value 'Hello, FastAPI!'. The browser or client will see {"message": "Hello, FastAPI!"}.

What is the first step to create a FastAPI app?

A Run a database

B Write HTML code

C Install React

D Import FastAPI and create an app instance

You start by importing FastAPI and creating an app instance to build your API.

Which command runs a FastAPI app with auto-reload?

A uvicorn main:app --reload

B npm start

C python main.py

D fastapi run

The 'uvicorn main:app --reload' command runs the app and reloads on code changes.

What does the function decorated with @app.get('/') respond to?

A POST requests to root URL

B GET requests to root URL

C Any request to /api

D PUT requests to root URL

The @app.get('/') decorator handles GET requests to the root URL.

What type of data does FastAPI return by default from a function?

A JSON

B Plain text

C HTML

D XML

FastAPI returns JSON responses by default.

Which Python keyword is used to define an async function in FastAPI?

A yield

B await

C async

D def

The 'async' keyword defines an asynchronous function.

Describe the steps to create and run your first FastAPI application.

Think about how you start a web server and respond to a web request.

Explain what happens when you visit the root URL of a FastAPI app with a simple @app.get('/') function.

Imagine you open a webpage and the server sends back a message.