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Posted on Mar 25

Building a Hands-Free Website Monitor with Python

#programming #webdev #javascript #python

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Want to Know When a Website Changes? Let Python Do It for You!

Ever found yourself manually checking a website every day just to see if something changed?

Maybe you're:

✅ Waiting for a product to go back in stock

✅ Tracking a job listing for updates

✅ Watching for a price drop on an item

What if you could stop checking manually and let Python alert you automatically whenever a website changes?

That’s exactly what we’re building today:

A hands-free website monitor that checks a webpage and notifies you when something changes. 🚀

Step 1: Install the Required Libraries

Before we start, install these:

pip install requests beautifulsoup4

requests → Fetches the webpage
BeautifulSoup → Extracts and compares page content

Step 2: Fetch the Webpage Content

First, we need to load the webpage and store its content:

import requests

URL = "https://example.com"  # The website you want to monitor

response = requests.get(URL)  # Fetch the webpage
html_content = response.text  # Store the HTML

This grabs the entire page as raw HTML.

Step 3: Extract Only the Important Part

Webpages have a lot of extra stuff we don’t need. We use BeautifulSoup to extract only what we care about:

from bs4 import BeautifulSoup

soup = BeautifulSoup(html_content, "html.parser")

# Find the part of the page that changes (e.g., price, stock, text)
target_element = soup.find("div", class_="price")  # Change this based on your website

if target_element:
    current_value = target_element.text.strip()
else:
    current_value = "Not found"

👉 Replace "div", class_="price" with the actual HTML tag and class for the element you want to monitor.

Step 4: Save the Initial Value

To check for changes, we need to remember the previous value. Let’s save it:

with open("previous_value.txt", "w") as file:
    file.write(current_value)

Step 5: Compare and Send an Alert

Now we check if the value changed and notify you if it did:

import time

while True:
    response = requests.get(URL)
    soup = BeautifulSoup(response.text, "html.parser")

    new_value = soup.find("div", class_="price").text.strip()

    # Read the previous value from the file
    with open("previous_value.txt", "r") as file:
        previous_value = file.read().strip()

    if new_value != previous_value:
        print(f"🔔 Change detected! New value: {new_value}")

        # Update the stored value
        with open("previous_value.txt", "w") as file:
            file.write(new_value)

    time.sleep(60)  # Wait 60 seconds before checking again

🚀 Now, Python watches the website for you!

If nothing changes, it keeps checking.
If the text changes, it alerts you in the terminal.

Step 6: Get Notified on Your Phone or Email

A terminal alert is nice, but why not get a text message or email?

To receive an email notification:

import smtplib

def send_email(message):
    sender_email = "your_email@gmail.com"
    receiver_email = "your_email@gmail.com"
    password = "your_app_password"

    with smtplib.SMTP("smtp.gmail.com", 587) as server:
        server.starttls()
        server.login(sender_email, password)
        server.sendmail(sender_email, receiver_email, f"Subject: Website Update\n\n{message}")

send_email(f"Website changed! New value: {new_value}")

📩 Now you get an email whenever something changes!

What’s Next? Level Up Your Python Skills

This is just the beginning! You can:

✅ Monitor multiple websites

✅ Send alerts via SMS, Telegram, or Slack

✅ Automate actions when a site updates

Want more real-world Python projects?

Check these out:

🔥 Trending Discussions – Stay updated with the latest Python trends

📚 Developer Resources – Tools to build better Python projects

📝 Articles – Guides on real-world Python automation

Now go automate something useful! 🚀

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