spyder中烧瓶应用程序出现不可写错误

Question

每当我在spyder中执行给定的flask代码时，都会给我UnsupportedOperation：non writable

   from flask import Flask
   from flaskext.mysql import MySQL
   app=Flask(__name__)
   app.config['MYSQL_HOST']="localhost"
   app.config['MYSQL_USER']="root"
   app.config['MYSQL_PASSWORD']=" "
   app.config['MYSQL_DB']="chetan"
   mysql=MySQL(app)
   @app.route('/')
   def show():
       cur=mysql.connection.cursor()
       cur.execute('''SELECT * FROM smpusers1 WHERE id=264''')
       s=cur.fetchall()
       return str(s)

   if __name__ == "__main__":
       app.run(debug=True)

app.run（debug = True）中出现错误