Book Image

Building Python Web APIs with FastAPI

By : Abdulazeez Abdulazeez Adeshina
Book Image

Building Python Web APIs with FastAPI

By: Abdulazeez Abdulazeez Adeshina

Overview of this book

RESTful web services are commonly used to create APIs for web-based applications owing to their light weight and high scalability. This book will show you how FastAPI, a high-performance web framework for building RESTful APIs in Python, allows you to build robust web APIs that are simple and intuitive and makes it easy to build quickly with very little boilerplate code. This book will help you set up a FastAPI application in no time and show you how to use FastAPI to build a REST API that receives and responds to user requests. You’ll go on to learn how to handle routing and authentication while working with databases in a FastAPI application. The book walks you through the four key areas: building and using routes for create, read, update, and delete (CRUD) operations; connecting the application to SQL and NoSQL databases; securing the application built; and deploying your application locally or to a cloud environment. By the end of this book, you’ll have developed a solid understanding of the FastAPI framework and be able to build and deploy robust REST APIs.
Table of Contents (14 chapters)
Part 1: An Introduction to FastAPI
Part 2: Building and Securing FastAPI Applications
Part 3: Testing And Deploying FastAPI Applications

Routing with the APIRouter class

The APIRouter class belongs to the FastAPI package and creates path operations for multiple routes. The APIRouter class encourages modularity and organization of application routing and logic.

The APIRouter class is imported from the fastapi package, and an instance is created. The route methods are created and distributed from the instance created, such as the following:

from fastapi import APIRouter
router = APIRouter()
async def say_hello() -> dict:
    return {"message": "Hello!"}

Let’s create a new path operation with the APIRouter class to create and retrieve todos. In the todos folder from the previous chapter, create a new file,

(venv)$ touch

We’ll start by importing the APIRouter class from the fastapi package and creating an instance:

from fastapi import APIRouter
todo_router = APIRouter().

Next, we’ll create...