Build a Price Comparison Tool with Python Web Scraping

Why Build a Price Comparison Tool? Price comparison tools are one of the most practical web scraping projects you can build. Whether it's for personal use (finding the best deals) or a business application (competitive pricing intelligence), the fundamentals are the same: scrape prices from multiple sources, normalize the data, and present the results. In this tutorial, I'll walk you through building a multi-site price scraper from scratch. Architecture Overview Our price comparison tool has four components: Scrapers — Site-specific modules that extract product data Normalizer — Cleans and standardizes data across sources Storage — SQLite database for price history Reporter — Generates comparison output ┌─────────────┐ ┌────────────┐ ┌──────────┐ ┌──────────┐ │ Scraper A │────▶│ │────▶│ │────▶│ │ │ Scraper B │────▶│ Normalizer │────▶│ SQLite │────▶│ Reporter │ │ Scraper C │────▶│ │────▶│ │────▶│ │ └─────────────┘ └────────────┘ └──────────┘ └──────────┘ Setting Up pip install requests