How to Monitor Website Changes and Get Alerts with Python

How to Monitor Website Changes and Get Alerts with Python Websites change constantly. Automated change detection saves hours of manual checking whether you track pricing, regulatory updates, or stock availability. Core Monitor import requests from bs4 import BeautifulSoup import hashlib , json , sqlite3 , difflib from datetime import datetime import time , re class WebMonitor : def __init__ ( self , db_path = ' monitor.db ' , api_key = None ): self . db = sqlite3 . connect ( db_path ) self . api_key = api_key self . session = requests . Session () self . session . headers . update ({ ' User-Agent ' : ' ChangeMonitor/1.0 ' }) self . _init_db () def _init_db ( self ): self . db . executescript ( ''' CREATE TABLE IF NOT EXISTS pages ( url TEXT PRIMARY KEY, selector TEXT, last_hash TEXT, last_content TEXT, last_checked DATETIME, interval INTEGER DEFAULT 3600); CREATE TABLE IF NOT EXISTS changes ( id INTEGER PRIMARY KEY AUTOINCREMENT, url TEXT, old TEXT, new TEXT, change_type TEXT, detected