title: Multiprocessing : use tqdm to display a progress bar
body: <p>To make my code more "pythonic" and faster, I use "multiprocessing" and a map function to send it a) the function and b) the range of iterations.</p>
  
  <p>The implanted solution (i.e., call tqdm directly on the range tqdm.tqdm(range(0, 30)) does not work with multiprocessing (as formulated in the code below). </p>
  
  <p>The progress bar is displayed from 0 to 100% (when python reads the code?) but it does not indicate the actual progress of the map function.</p>
  
  <p><strong>How to display a progress bar that indicates at which step the 'map' function is ?</strong></p>
  
  <pre><code>from multiprocessing import Pool
  import tqdm
  import time
  
  def _foo(my_number):
     square = my_number * my_number
     time.sleep(1)
     return square 
  
  if __name__ == '__main__':
     p = Pool(2)
     r = p.map(_foo, tqdm.tqdm(range(0, 30)))
     p.close()
     p.join()
  </code></pre>
  
  <p>Any help or suggestions are welcome...</p>