Parallelism in one line(medium.com)

  In [1]: import multiprocessing
  In [2]: pool = multiprocessing.Pool(8)
  In [3]: def hello(x):
  ....:     return x+1
  ....:
  In [5]: stuff = range(10)
  In [4]: pool.map(hello, stuff)
  # cryptic errors

  import multiprocessing
  def run_stuff():
      pool = multiprocessing.Pool(8)
        def hello(x):
          return x+1
      stuff = range(10)
      return pool.map(hello, stuff)

  print(run_stuff())

    from gevent import monkey
    monkey.patch_all()

    pool = Pool()    
    pool.map(create_thumbnail, images)
    pool.close()
    pool.join()

    with ThreadPoolExecutor(max_workers=4) as executor:
        executor.map(create_thumbnail, images)

    List<String> contents = Arrays.stream(urls).parallel().map(UrlLoader::getContent).collect(Collectors.toList());

    public class UrlLoader {
      private static String getContent(String url) {
        try {
          return new BufferedReader(new InputStreamReader(new URL(url).openConnection().getInputStream())).lines().collect(Collectors.joining("\n"));
        } catch (IOException e) {
          throw new IOError(e);
        }
      }
    }