def process_data(data, filter=None):
    # Process the data
    result = []
    for item in data:
        if filter and not filter(item):
            continue
        result.append(transform(item))
    return result

def process_data(data, filter=None):
    """
    Process and transform a collection of data items with optional filtering.
    
    Args:
        data (list): A list of items to process
        filter (callable, optional): A function that returns True for items 
            to include. If None, all items are processed.
    
    Returns:
        list: A list of transformed items that passed the filter
    
    Example:
        >>> data = [1, 2, 3, 4, 5]
        >>> process_data(data, filter=lambda x: x > 2)
        [3, 4, 5]
    """
    result = []
    for item in data:
        if filter and not filter(item):
            continue
        result.append(transform(item))
    return result

# Web Scraper Tool

A lightweight, efficient web scraping library for extracting structured data from websites.

## Features
- 🚀 Fast and asynchronous scraping
- 🛡️ Built-in rate limiting and error handling
- 📊 Export data to JSON, CSV, or databases
- 🔍 CSS and XPath selector support

## Installation

```bash
pip install web-scraper-tool

from scraper import WebScraper

# Initialize scraper
scraper = WebScraper()

# Scrape a website
data = scraper.scrape('https://example.com', {
    'title': 'h1.title',
    'price': '.price'
})

print(data)

## Notes
- Keep documentation up-to-date with code changes
- Use consistent formatting and style
- Include visual aids when helpful (diagrams, screenshots)
- Test all code examples to ensure they work
- Consider internationalization for broader audiences