【FastAPI】HelloWorld

FastAPI

FastAPI框架&＃xff0c;高性能&＃xff0c;易学&＃xff0c;快速编码&＃xff0c;可投入生产
FastAPI是一种现代&＃xff0c;快速&＃xff08;高性能&＃xff09;的Web框架&＃xff0c;用于基于标准Python类型提示使用Python 3.6&＃43;构建API。

文档&＃xff1a;https : //fastapi.tiangolo.com
源代码&＃xff1a;https : //github.com/tiangolo/fastapi

Hello World

集各大框架于一身&＃xff0c;站在巨人肩膀上的FastAPI环境搭建起来还是比较简单的。
短短几行代码就可以完成接口开发&＃xff0c;与接口文档的开发。

from fastapi import FastAPIapp &＃61; FastAPI()&＃64;app.get("/")
def read_root():return {"Hello": "World"}&＃64;app.get("/items/{item_id}")
def read_item(item_id: int, q: str &＃61; None):return {"item_id": item_id, "q": q}if __name__ &＃61;&＃61; &＃39;__main__&＃39;:import uvicornuvicorn.run(app, host&＃61;"0.0.0.0", port&＃61;8000, workers&＃61;4)

API

http://127.0.0.1:8000/

交互式API文档

http://127.0.0.1:8000/docs

Windows可能的报错

报错提示1

Traceback (most recent call last):File "D:/coding/vn-var-test/test/main.py", line 19, in <module>uvicorn.run(app, host&＃61;&＃39;127.0.0.1&＃39;, port&＃61;8000, workers&＃61;3)File "D:\Python\Python37\lib\site-packages\uvicorn\main.py", line 272, in runsocket &＃61; config.bind_socket()File "D:\Python\Python37\lib\site-packages\uvicorn\config.py", line 216, in bind_socketsock.bind((self.host, self.port))
OSError: [WinError 10013] 以一种访问权限不允许的方式做了一个访问套接字的尝试。


报错提示2

由于添加了异常值处理中间件&＃xff0c;报错信息看起来是序列化的问题&＃xff0c;和报错提示1的问题一样

Traceback (most recent call last):File "D:/coding/ivc/app.py", line 53, in <module>uvicorn.run(app, host&＃61;"127.0.0.1", port&＃61;8000, workers&＃61;4)File "D:\Python\Python37\lib\site-packages\uvicorn\main.py", line 274, in runsupervisor.run(server.run, sockets&＃61;[socket])File "D:\Python\Python37\lib\site-packages\uvicorn\supervisors\multiprocess.py", line 33, in runprocess.start()File "D:\Python\Python37\lib\multiprocessing\process.py", line 112, in startself._popen &＃61; self._Popen(self)File "D:\Python\Python37\lib\multiprocessing\context.py", line 223, in _Popenreturn _default_context.get_context().Process._Popen(process_obj)File "D:\Python\Python37\lib\multiprocessing\context.py", line 322, in _Popenreturn Popen(process_obj)File "D:\Python\Python37\lib\multiprocessing\popen_spawn_win32.py", line 65, in __init__reduction.dump(process_obj, to_child)File "D:\Python\Python37\lib\multiprocessing\reduction.py", line 60, in dumpForkingPickler(file, protocol).dump(obj)
AttributeError: Can&＃39;t pickle local object &＃39;FastAPI.setup.<locals>.openapi&＃39;


解决方式

uvicorn.run(app, host&＃61;"0.0.0.0", port&＃61;8000, workers&＃61;4)# 替换为uvicorn.run(app, host&＃61;"0.0.0.0", port&＃61;8000)