# -*- encoding: utf-8 -*-
#導包
from flask import Flask

#建立flask物件
app = Flask(__name__)

#使用flask路由器 指定網址和控制器
@app.route("/")
def index():
return "hello world 你好世界"
 
#使用程式入口將flask應用啟動
if __name__ == "__main__":
app.run(debug=True)

首先在學習Flask框架時應該學會基本的網頁連結，注意utf-8碼不能錯誤，

C:\Users\Lenovo\www\web>python zida.py
 * Serving Flask app "zida" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 234-424-956
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)