test.py

import boto3
from random import choices
import random
from string import ascii_uppercase
import base64
import json
import datetime

client = boto3.client('firehose')

while True:
    data = {
            'created_at' :  str(datetime.datetime.now(datetime.timezone(datetime.timedelta(hours=9)))),
            'ticker_symbol': "".join(choices(ascii_uppercase, k=3)),
            'sector': 'tekito',
            'change': random.random(),
            'price': random.random()
            }
    print(data)
    data_json = json.dumps(data)
    client.put_record(
         DeliveryStreamName="LogDelivery",
         Record={'Data': bytes(data_json+"\n", 'utf-8')}
        )