How do we calculate btc percent change in python on websocket stream

I can't get output when am calculating btc daily percent Change in python using websocket stream, my websocket only shows open connection, but can not output the percent result

I want to place a buy order each time btc daily percent changes to 0.2 percent from open price to the close price

Sample code

import json

import websocket

#/////////////////////////////////////////////

coin_name=input("ENTER SYMBOLE NAME TO TRADE IN BINANCE FUTURES :\n")

symbol_name=coin_name.lower()+"@kline_1d"

print(symbol_name)

SYMBOLL, OPEN,HIGH,LOW,CLOSE,=[],[],[],[],[]

#///////////////////////////////////////////

MESSAGE_SUB={"method": "SUBSCRIBE","params": [symbol_name],"id": 1}

def on_open(ws):

MESSAGE_SUB

ws.send(json.dumps(MESSAGE_SUB))

print("OPEN CONECTION")

#////////////////////////////////////

def on_message(ws, message):

msg=json.loads(message)

bars=msg["k"]

if bars["x"]==False:

OPEN.append(bars["o"])

HIGH.append(bars["h"])

LOW.append(bars["l"])

CLOSE.append(bars["c"])

SYMBOLL.append(bars["s"])

#[THIS IS THE PERCENTAGE CALCULATIONS] def percent_change(new_price,old_price):

pc=round ((new_price -old_price)/abs(old_price)*100,2)

print (pc)

percent_change (CLOSE,OPEN)

////////////////////////////////////

url="http://wss://fstream.binance.com/ws (wss://fstream.binance.com/ws)"

////////////////////////////////////

ws=websocket.WebSocketApp(url,on_open=on_open,on_message=on_message)

////////////////////////////////////

ws.run_forever()

source https://stackoverflow.com/questions/75737948/how-do-we-calculate-btc-percent-change-in-python-on-websocket-stream