tracker.py

# selenium is picked because of the dynamically loaded content
# otherwise, you would only get the page source and not the content the javascript loads
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

from dotenv import load_dotenv
import os

load_dotenv()

EMAIL = os.getenv('EMAIL')
PASSWORD = os.getenv('PASSWORD')

import smtplib
from email.mime.text import MIMEText

op = webdriver.ChromeOptions()
op.add_argument('headless')
op.add_argument('user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36')
driver = webdriver.Chrome(options=op)


# kirkland irons
#   https://www.costco.com/kirkland-signature-7-piece-players-iron-set%2C-right-handed.product.4000236767.html
# kirkland putter
#   https://www.costco.com/kirkland-signature-ks1-putter---right-handed-.product.100645850.html

# change link here 
link = "https://www.costco.com/kirkland-signature-7-piece-players-iron-set%2C-right-handed.product.4000236767.html"

# change your email to here
recipients = ['']

# change the message here
msg = ''

driver.get(link)

try:
    element = WebDriverWait(driver, 5).until(
        EC.presence_of_element_located((By.ID, "add-to-cart-btn"))    
    )
    button_html = element.get_attribute('outerHTML')

    out_of_stock = 'value="Out of Stock"'
    in_stock = 'value="Add to Cart"'
    if out_of_stock in button_html:
        print("out of stock")
    elif in_stock in button_html:
        send_email("in_stock", msg)
    else:
        send_email("error", "incorrect link")
except Exception as e:
    send_email("error", e)

finally:
    driver.quit()


def send_email(subject, body):
    msg = MIMEText(body)
    msg['Subject'] = subject
    msg['From'] = EMAIL
    msg['To'] = ', '.join(recipients)
    with smtplib.SMTP_SSL('smtp.gmail.com', 465) as smtp_server:
       smtp_server.login(EMAIL, PASSWORD)
       smtp_server.sendmail(EMAIL, recipients, msg.as_string())
    print("Message sent!")