Python Product Price Monitor

import requests
from bs4 import BeautifulSoup
import smtplib
from email.mime.text import MIMEText
from email.header import Header
import time
from datetime import datetime, timedelta
import pytz

# Email account information
my_email = "yours@mutou.men"
my_password = "123456"
recipient_email = "abc@outlook.com"

# Product links and target price list. Fill in your desired price after target_price.
products = [
    {"url": "https://www.usa.canon.com/shop/p/refurbished-rf50mm-f1-8-stm", "target_price": 100, "reached_target": False, "last_price": None},
    {"url": "https://www.usa.canon.com/shop/p/refurbished-eos-r8?color=Black&type=Refurbished", "target_price": 600, "reached_target": False, "last_price": None}
]

def get_price(url):
    """Get the product price from the specified URL."""
    try:
        response = requests.get(url, timeout=10)
        response.raise_for_status()
        soup = BeautifulSoup(response.content, "html.parser")
        
        if "canon.com" in url:
            price_tag = soup.find("span", {"class": "price"})
            if price_tag:
                price_str = price_tag.text.strip().replace("$", "").replace(",", "")
                return float(price_str)
            else:
                raise ValueError("Price tag not found")
        else:
            raise ValueError("Unsupported URL format")
        
    except requests.RequestException as e:
        print(f"Error getting price for {url}: network issue - {e}")
    except Exception as e:
        print(f"Error getting price for {url}: {e}")
    return None

def send_email(subject, message):
    """Send an email notification with the specified subject and message."""
    try:
        msg = MIMEText(message, "plain", "utf-8")
        msg["Subject"] = Header(subject, "utf-8")
        msg["From"] = my_email
        msg["To"] = recipient_email
        
        server = smtplib.SMTP_SSL("smtp.exmail.qq.com", 465)
        server.login(my_email, my_password)
        server.sendmail(my_email, recipient_email, msg.as_string())
        server.quit()
        
        print("Email sent successfully.")
    except Exception as e:
        print(f"Error sending email: {e}")

def main():
    """Main function for monitoring product prices and sending notifications."""
    # Set timezone to Beijing time
    tz = pytz.timezone('Asia/Shanghai')
    
    while True:
        now = datetime.now(tz)
        current_time = now.strftime("%H:%M:%S")
        
        # Send a confirmation email every morning at 8:00
        if current_time == "08:00:00":
            subject = "Program Running Confirmation"
            message = "Your monitoring program is still running."
            send_email(subject, message)
        
        print("Starting monitoring. Current time:", now)
        
        for p in products:
            current_price = get_price(p["url"])
            if current_price is not None:
                print(f"Product {p['url']} current price is ${current_price}")
                if current_price <= p["target_price"]:
                    if not p["reached_target"] or (p["last_price"] is not None and current_price > p["last_price"]):
                        subject = "Product price reached target!"
                        message = f"Product {p['url']} current price is ${current_price}, which has reached your target price of ${p['target_price']}."
                        send_email(subject, message)
                        print(f"Product {p['url']} current price is ${current_price}")
                        p["reached_target"] = True
                else:
                    p["reached_target"] = False  # Resume monitoring after the price rises
                p["last_price"] = current_price
        
        # Print next check time and wait for 1 hour
        next_check_time = now + timedelta(hours=1)
        print(f"This monitoring cycle has ended. Next check time: {next_check_time} (1-hour interval)")
        time.sleep(3600)

if __name__ == "__main__":
    main()

nohup python3 your_script.py > script.log 2>&1 &

ps aux | grep your_script.py