FastAPI - Modern Python Web Framework

FastAPI is a modern web framework for building APIs with Python. It's fast, easy to use, and provides automatic documentation.

GitHub

https://github.com/tiangolo/fastapi

Key Features

Fast: High performance, on par with NodeJS and Go

Fast to code: Increase development speed by 200-300%

Automatic docs: Interactive API documentation (Swagger UI)

Type validation: Based on Python type hints

Async support: Native async/await support

Installation

ash
pip install fastapi uvicorn


Quick Start

python
from fastapi import FastAPI

app = FastAPI()

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

Run: uvicorn main:app --reload

Example: Create User API

python
from pydantic import BaseModel

class User(BaseModel):
name: str
email: str
age: int = 18

@app.post("/users/")
def create_user(user: User):
# Automatic validation
return {"message": "User created", "user": user}

@app.get("/users/{user_id}")
def get_user(user_id: int):
return {"user_id": user_id, "name": f"User {user_id}"}


Automatic Documentation

Visit these URLs after starting your app:

Swagger UI: http://localhost:8000/docs

ReDoc: http://localhost:8000/redoc

Performance

| Framework | Requests/sec |
|-----------|-------------|
| FastAPI | 26,000 |
| Flask | 12,000 |
| Django | 7,000 |

Why FastAPI?

Modern Python features (type hints, async)

Automatic API documentation

Built-in data validation

Great editor support

Easy to learn and use

Use Cases

REST APIs

Microservices

Machine learning model serving

Real-time applications

Summary

FastAPI is an excellent choice for building modern Python APIs. It combines simplicity with power and performance. If you're starting a new API project, give FastAPI a try!

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Rating: 猸愨瓙猸愨瓙猸?
Best for: API development, microservices
Learning curve: 猸愨瓙