快速建立API服務使用 flask，要先安裝
先執行 python -m pip install flask
然後寫個 app.py 檔案
上代碼! 如下:

from flask import Flask, request, jsonify
import time, random

app = Flask(__name__)

bookStoreList = [
    {"id": 1, "name": "PYTHON_DEV", "price": 100, "count":10},
    {"id": 2, "name": "JAVA_DEV", "price": 200, "count":20},
    {"id": 3, "name": "GOLANG_DEV", "price": 300, "count":30},
    {"id": 3, "name": "C#_DEV", "price": 400, "count":40}
]

def _find_next_id():
    return max(book["id"] for book in bookStoreList) + 1
    
def _find_book(name):
    
    result = list(filter(lambda data: data.get('name')==name, bookStoreList))
    if len(result) > 0 :
        return {'success':True,'bookinfo':result[0]}
    else :
        return {'success':False,'bookinfo':None}

@app.get("/bookstore/getbooks")
def get_books():
    return jsonify(bookStoreList)

@app.post("/bookstore/buybook")
def buy_book():
    if request.is_json:
        bookinfo = request.get_json()
        print('bookinfo: ', bookinfo)
        # 隨機API耗費時間 1~10s
        time.sleep(random.randrange(1,10))
        return jsonify(_find_book(bookinfo["BookName"])), 201
    return {"error": "Request must be JSON"}, 415

@app.post("/bookstore/addbook")
def add_book():
    if request.is_json:
        newbookinfo = request.get_json()
        newbookinfo["id"] = _find_next_id()
        bookStoreList.append(newbookinfo)
        return newbookinfo, 201
    return {"error": "Request must be JSON"}, 415
    
if __name__ == "__main__":
    app.run(host="0.0.0.0", port=8321)

完成後直接執行 python app，便可以看到以下資訊

代表API服務已經成功啟動，然後就可以開始做測試，
這邊我自己啟動的port是 8321，這個可自行調整
改 app.run(host="0.0.0.0", port=8321) 這個就行了
裡面有幾隻API其中一支的 curl 如下

curl --location --request POST 'http://127.0.0.1:8321/bookstore/buybook' \
--header 'Content-Type: application/json' \
--data-raw '{
    "BookName":"PYTHON_DEV"
}'

另外為了給第一篇做測試，/bookstore/buybook 裡面有加 隨機API耗費時間，
大概就這樣，Cheer !