title: A very simple multithreading parallel URL fetching (without queue)
body: <p>I spent a whole day looking for the simplest possible multithreaded URL fetcher in Python, but most scripts I found are using queues or multiprocessing or complex libraries.</p>
  
  <p>Finally I wrote one myself, which I am reporting as an answer. Please feel free to suggest any improvement.</p>
  
  <p>I guess other people might have been looking for something similar.</p>