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
Python
Short Answer: No, but it depends on: * Python version being used * Package structure requirements * Specific functionality needed Detailed Breakdown: 1. Python Version Considerations * Python < 3.3: Required in every directory to be recognized as a package * Python 3.3+: Not strictly required (namespace packages) but still commonly used 2.
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
Unclassified
Playwright Stealth refers to techniques and plugins used to make browser automation with Playwright appear more like a regular user browser, helping to avoid detection by anti-bot systems. Why is it Needed? Modern websites employ various detection mechanisms to identify automated browsers through: * Browser fingerprinting * Automation-specific API flags * Behavioral patterns
Python
* A special Python file used to mark directories as Python package directories * Required in Python versions prior to 3.3 to make a directory recognized as a package * Can be empty or contain initialization code for the package * Key file in Python's package structure and import system Key
Python
The __pycache__ directory is automatically created by Python to store compiled bytecode files (.pyc files) when you import modules. Here's what you need to know: 1. Purpose: * Speeds up subsequent imports of the same module * Contains pre-compiled bytecode (optimized intermediate format) instead of re-parsing source code every time
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
Unclassified
Overview xvfb-run is a wrapper script that automatically manages Xvfb (X Virtual Frame Buffer) displays for running X Window System applications in environments without physical displays. It's particularly useful for: * Headless servers * Automated testing environments * Continuous Integration (CI) pipelines * Running GUI applications without physical hardware Key Features * Automatic
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