[러닝-인강] websockets - 데이터의 양이 많지 않을 때

import websocket
import json
try:
    import thread
except ImportError:
    import _thread as thread
import time
from pandas import DataFrame

dataFromServer = [ ]

def on_message(ws, message):
    get_message = json.loads(message.decode('utf-8'))
    dataFromServer.append(get_message)
    print(get_message)

def on_error(ws, error):
    print(error)

def on_close(ws):
    df = DataFrame(dataFromServer)
    print(df.head())
    print("close")

def on_open(ws):
    def run(*args):
        sendData = '[{"ticket":"test"},{"type":"ticker","codes":["KRW-CPT","KRW-ADA"]}]'
        for i in range(3):
            ws.send(sendData)
            time.sleep(1)
        ws.close()
    thread.start_new_thread(run, ())

ws = websocket.WebSocketApp("wss://api.upbit.com/websocket/v1",
                              on_message = on_message,
                              on_error = on_error,
                              on_close = on_close)
ws.on_open = on_open
ws.run_forever()