What is python FastAPI ?

 FastAPI is a modern, high-performance web framework for building APIs with Python.¹ It's designed to be fast, efficient, and easy to use, making it a popular choice for developers who want to create robust and scalable APIs.²

Key Features of FastAPI:

• High Performance: Built on top of Starlette, FastAPI is incredibly fast, making it ideal for high-traffic applications.
• Automatic Data Validation and Serialization: FastAPI uses Python type hints to automatically validate and serialize data, reducing the amount of boilerplate code required.³
• Automatic Documentation: FastAPI generates interactive API documentation using OpenAPI, making it easy to understand and use your API.⁴
• Asynchronous Support: FastAPI supports asynchronous programming, allowing you to handle multiple requests concurrently and improve performance.⁵
• Easy to Learn: FastAPI has a simple and intuitive syntax, making it easy to learn and use, even for developers who are new to web frameworks.⁶

Example:

Here's a simple example of a FastAPI application:

Python

from fastapi import FastAPI

app = FastAPI()

@app.get("/")
async def root():
    return {"message": "Hello World"}

@app.get("/items/{item_id}")
async def read_item(item_id: int):
    return {"item_id": item_id}

This code defines two endpoints:

1. /: This endpoint returns a simple JSON response with a "message" key.
2. /items/{item_id}: This endpoint takes an integer item_id as a path parameter and returns a JSON response with the item_id.

To run this application, you can use the uvicorn ASGI server:

Bash

uvicorn main:app --reload

This will start the server and you can access the API endpoints in your browser or using tools like Postman.

Why Use FastAPI?

FastAPI is a great choice for building APIs in Python because it offers a number of advantages:

• Speed: FastAPI is one of the fastest Python web frameworks available.⁷
• Ease of Use: It's easy to learn and use, with a simple and intuitive syntax.⁸
• Productivity: Automatic data validation, serialization, and documentation save you time and effort.⁹
• Scalability: FastAPI is designed to handle high traffic loads.¹⁰

If you're looking to build fast, efficient, and well-documented APIs in Python, FastAPI is an excellent choice.