Web Scraping
1. Inspect the Website Structure Use browser developer tools (Right-click → Inspect) to: * Examine HTML structure (Elements tab) * Identify patterns in element classes/IDs * View network requests (Network tab) 2. Look for These Key Indicators <!-- Unique identifiers --> <div id="product-price-1234">$99.99<
Web Scraping
1. Basic Definitions CSV (Comma-Separated Values) * Simple text format for tabular data * Stores data in plain text with values separated by commas * No native support for hierarchical data JSON (JavaScript Object Notation) * Lightweight data-interchange format * Key-value pair structure with nested objects support * Native support for complex data structures 2. Structural
Web Scraping
Browser developer tools are essential for modern web scraping. They help you inspect page structure, test selectors, and identify patterns in website markup. Here's a comprehensive guide: 1. Opening Developer Tools * Keyboard shortcut: * F12 (Windows/Linux) * Cmd+Opt+I (Mac) * Right-click method: * Right-click any page element → "Inspect&
Python
1. What is Web Scraping? * Automated extraction of data from websites * Converts unstructured web data into structured format * Common use cases: Price monitoring, market research, lead generation 2. Core Components 2.1 HTTP Requests * Libraries: * requests (simple HTTP requests) * urllib (built-in library) * Example: import requests response = requests.get('https:
Web Scraping
Learn how to use browser developer tools to inspect and extract web page elements through the JavaScript console. Basic Techniques 1. Accessing the Console * Chrome/Firefox: F12 or Right-click → "Inspect" → "Console" tab * Safari: Enable Develop menu in Preferences → ⌥⌘C 2. Selecting Elements // Single element document.querySelector(
Web Scraping
Direct Database Insertion Pros ✅ * Immediate persistence: Eliminates intermediate storage steps * Simplified architecture: Fewer components to maintain * Real-time availability: Data is instantly queryable Direct Database Insertion Cons ❌ * Single point of failure: Database issues can crash entire scraping process * Data validation challenges: Risk of inserting malformed data * Connection overhead: Database connections might
Web Scraping
XPath (XML Path Language) is a query language used to navigate through elements and attributes in an XML document. It provides a syntax for defining parts of an XML document and is widely used in XML processing, web scraping, and data extraction tasks. Key Concepts 1. Nodes XPath treats XML
Web Scraping
Overview XPath and CSS selectors are both query languages used to navigate and select elements in HTML/XML documents, but they have distinct characteristics: Feature XPath CSS Selectors Language Type XML path language Style sheet language Complexity More powerful/verbose Simpler syntax Direction Can navigate upward Only downward Text Matching