简介
FastAPI是流行的Python web框架，适用于开发高吞吐量API和微服务（直接支持异步编程）
FastAPI的优势之一：通过提供高级抽象和自动数据模型转换，简化请求数据的处理（用户不需要手动处理原始请求数据），并能根据路由和 Pydantic 模型自动生成 OpenAPI 接口文档。
- Swagger UI
- ReDoc
demo
import uuidimport uvicornfrom typing import Any, Union, Optionalfrom typing_extensions import Literalfrom fastapi import Body, FastAPIfrom pydantic import (BaseModel,Field,UUID4)app = FastAPI()class UserIn(BaseModel):channel: Literal[0, 1] = Field(0, title="渠道")username: str = Field(..., title="用户名")password: str = Field(..., title="用户密码", description="长度6-8位")email: str = Field(..., title="用户邮箱地址")full_name: str = Field(None, title="用户全名")request_id: Optional[UUID4]class UserOut(BaseModel):username: str = Field(..., title="用户名")email: str = Field(..., title="用户邮箱地址")full_name: str = Field(None, title="用户全名")request_id: Optional[UUID4]# FastAPI will take care of filtering out all the data that is not declared in the output model (using Pydantic).# 因此，FastAPI将负责过滤掉输出模型中未声明的所有数据（使用Pydantic）。@app.post("/user/", response_model=UserOut)async def create_user(user: UserIn = Body(examples={"example1": {"summary": "A short summary or description of the example","value": {# example data here"channel": 0,"username": "Foo","password": "33759","email": "chencare@163.com","full_name": "xiaotao"}}})) -> UserOut:user.request_id = uuid.uuid4()print(user.request_id)return userif __name__ == '__main__':uvicorn.run(app=app, access_log=True, port=9988)运行后，会提示Uvicorn running on http://127.0.0.1:9988 (Press CTRL+C to quit)
在浏览器输入http://127.0.0.1:9988/redoc（ ReDoc）,http://127.0.0.1:9988/docs（Swagger UI ）即可查看
ReDoc 页面如下：
ReDoc vs. Swagger UI
ReDoc更美观，Swagger UI更注重交互（用户直接从界面中发送请求，查看响应，这对于测试和调试 API 非常有用。）