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FastAPI - Modern Python Web Framework

📅 2026/3/23 👁️ 73 阅读 ✏️ 2026/3/23 更新

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



    text
    ash
pip install fastapi uvicorn


    Quick Start



    text
    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



    text
    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!



    Rating: 猸愨瓙猸愨瓙猸?
    Best for: API development, microservices
    Learning curve: 猸愨瓙
    标签：
    Pythonweb-frameworkAPIasync

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