code: def event_download_photos(photos):
      
      try:
          assert gevent
          assert grequests
      except NameError:
          logger.error('You need install gevent module. Aborting...')
          sys.exit(1)
      global counter
      counter = len(photos)
      from gevent.pool import Pool
      pool = Pool(multiprocessing.cpu_count())
      jobs = [pool.spawn(download_photo_async, photo) for photo in photos]
      pool.join()
docs: Use asynchronous I/O to download photos
  
      :param photos: The photos to be downloaded
      :type photos: list of dicts