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Multithreading & Multiprocessing · Lesson 53 of 56

Web Scraping with Threads

Source: 16-Multithreading and Multiprocessing/webscrapping_multi_threading.py

Start here — no coding background needed

What you will learn

Fetch many web pages faster with threads — ethical use only.

In simple words

Scraping means reading public web data. Always respect site rules and laws.

Do many tasks at once — advanced; understand ideas first, code locally later.

Easy example — try this first

Easy example — run this first. Change values and press Run again.

Python

Runs in your browser via Pyodide — no server. First run may take a few seconds.

Reference notes (from full bootcamp)

Optional — deeper detail for when you are ready

Reference script from the bootcamp repo. Read the code below; run a simplified version in the playground when marked runnable.

Example HCL
HCL
'''
Real-World Example: Multithreading for I/O-bound Tasks
Scenario: Web Scraping
Web scraping often involves making numerous network requests to 
fetch web pages. These tasks are I/O-bound because they spend a lot of
time waiting for responses from servers. Multithreading can significantly
improve the performance by allowing multiple web pages to be fetched concurrently.

'''

'''

https://python.langchain.com/v0.2/docs/introduction/

https://python.langchain.com/v0.2/docs/concepts/

https://python.langchain.com/v0.2/docs/tutorials/
'''

import threading
import requests
from bs4 import BeautifulSoup

urls=[
'https://python.langchain.com/v0.2/docs/introduction/',

'https://python.langchain.com/v0.2/docs/concepts/',

'https://python.langchain.com/v0.2/docs/tutorials/'

]

def fetch_content(url):
    response=requests.get(url)
    soup=BeautifulSoup(response.content,'html.parser')
    print(f'Fetched {len(soup.text)} characters from {url}')

threads=[]

for url in urls:
    thread=threading.Thread(target=fetch_content,args=(url,))
    threads.append(thread)
    thread.start()

for thread in threads:
    thread.join()

print("All web pages fetched")

Browser practice only — full example needs Python on your computer (files, Flask, threads, etc.).

Practice test — try yourself

Write code, press Check. Wrong answer shows the correct code to copy & run.

You learned "Web Scraping with Threads". Use print() to show: Done: Web Scraping with Threads

Hint: Use one print() with the exact text.

Python