Fast API

FastAPI is a modern, fast (high-performance) web framework for building APIs with Python 3.7+ based on standard Python type hints. It is designed to be easy to use and provide high performance, with automatic validation of request and response data, and automatic generation of OpenAPI and JSON Schema documentation.

Installation

To install FastAPI, simply use pip:

pip install fastapi

You may also want to install the uvicorn server, which is the recommended server to use with FastAPI:

pip install uvicorn[standard]

Usage

Here's an example of how to create a simple FastAPI app:

from fastapi import FastAPI

app = FastAPI()

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

In this example, we first import the FastAPI class from the fastapi module. We then create an instance of FastAPI() and store it in the app variable.

Next, we define a GET endpoint for the root path / using the @app.get() decorator. The root() function returns a simple JSON object with the message "Hello, World!".

Finally, we start the app using the uvicorn server:

uvicorn main:app --reload

Here, main refers to the name of our Python module (i.e., main.py), and app refers to the name of the instance of FastAPI().

Conclusion

In this example, we showed you how to create a simple FastAPI app that responds with a "Hello, World!" message. FastAPI is a powerful and easy-to-use framework for building high-performance web APIs with Python, and it has many more features and capabilities beyond what we covered here. We encourage you to explore the FastAPI documentation to learn more!