【FastAPI】Hello World

FastAPI

FastAPI框架，高性能，易學，快速編碼，可投入生產
FastAPI是一種現代，快速（高性能）的Web框架，用於基於標準Python類型提示使用Python 3.6+構建API。

文檔：https : //fastapi.tiangolo.com
源代碼：https : //github.com/tiangolo/fastapi

Hello World

集各大框架於一身，站在巨人肩膀上的FastAPI環境搭建起來還是比較簡單的。
短短几行代碼就可以完成接口開發，與接口文檔的開發。

from fastapi import FastAPI

app = FastAPI()


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


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str = None):
    return {"item_id": item_id, "q": q}

if __name__ == '__main__':
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000, workers=4)

API

http://127.0.0.1:8000/

交互式API文檔

http://127.0.0.1:8000/docs

Windows可能的報錯

報錯提示1

Traceback (most recent call last):
  File "D:/coding/vn-var-test/test/main.py", line 19, in <module>
    uvicorn.run(app, host='127.0.0.1', port=8000, workers=3)
  File "D:\Python\Python37\lib\site-packages\uvicorn\main.py", line 272, in run
    socket = config.bind_socket()
  File "D:\Python\Python37\lib\site-packages\uvicorn\config.py", line 216, in bind_socket
    sock.bind((self.host, self.port))
OSError: [WinError 10013] 以一種訪問權限不允許的方式做了一個訪問套接字的嘗試。

報錯提示2

由於添加了異常值處理中間件，報錯信息看起來是序列化的問題，和報錯提示1的問題一樣

Traceback (most recent call last):
  File "D:/coding/ivc/app.py", line 53, in <module>
    uvicorn.run(app, host="127.0.0.1", port=8000, workers=4)
  File "D:\Python\Python37\lib\site-packages\uvicorn\main.py", line 274, in run
    supervisor.run(server.run, sockets=[socket])
  File "D:\Python\Python37\lib\site-packages\uvicorn\supervisors\multiprocess.py", line 33, in run
    process.start()
  File "D:\Python\Python37\lib\multiprocessing\process.py", line 112, in start
    self._popen = self._Popen(self)
  File "D:\Python\Python37\lib\multiprocessing\context.py", line 223, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "D:\Python\Python37\lib\multiprocessing\context.py", line 322, in _Popen
    return 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 dump
    ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 'FastAPI.setup.<locals>.openapi'

解決方式

    uvicorn.run(app, host="0.0.0.0", port=8000, workers=4)
    # 替換爲
    uvicorn.run(app, host="0.0.0.0", port=8000)