Challenge: Threaded Web Scraper
Imagine you are tasked with collecting information from a list of web pages, such as fetching the latest news headlines or product prices from several sites. Doing this sequentially—one after another—would be slow, especially if some pages take longer to respond. To speed up the process, you want to fetch multiple pages at the same time using threads. This approach allows you to make the most of waiting times, retrieving data from several sites concurrently and processing results as soon as they arrive.
Swipe to start coding
Your goal is to implement a threaded web scraper that fetches the content of multiple URLs in parallel and processes the results.
- Complete the function
fetch_url_content(url)so that it downloads and returns the first 100 characters of the response content from the providedurl. - In the
main()function, use thethreadingmodule to start a new thread for each URL in theurlslist, where each thread callsfetch_url_content(url)and prints the result in the format:Content from {url}: {snippet}where{url}is the URL and{snippet}is the first 100 characters returned byfetch_url_content. - Ensure the main thread waits for all threads to finish before exiting.
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Can you explain how threading helps speed up web scraping?
What are some potential issues to watch out for when using threads for web scraping?
Can you show me a simple example of fetching multiple web pages using threads?
Awesome!
Completion rate improved to 6.25Challenge: Threaded Web Scraper
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Imagine you are tasked with collecting information from a list of web pages, such as fetching the latest news headlines or product prices from several sites. Doing this sequentially—one after another—would be slow, especially if some pages take longer to respond. To speed up the process, you want to fetch multiple pages at the same time using threads. This approach allows you to make the most of waiting times, retrieving data from several sites concurrently and processing results as soon as they arrive.
Swipe to start coding
Your goal is to implement a threaded web scraper that fetches the content of multiple URLs in parallel and processes the results.
- Complete the function
fetch_url_content(url)so that it downloads and returns the first 100 characters of the response content from the providedurl. - In the
main()function, use thethreadingmodule to start a new thread for each URL in theurlslist, where each thread callsfetch_url_content(url)and prints the result in the format:Content from {url}: {snippet}where{url}is the URL and{snippet}is the first 100 characters returned byfetch_url_content. - Ensure the main thread waits for all threads to finish before exiting.
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