docs: def multithreader(args, paths):
      """Execute multiple processes at once."""
  
      def shellprocess(path):
          """Return a ready-to-use subprocess."""
          import subprocess
          return subprocess.Popen(args + [path],
                                  stderr=subprocess.DEVNULL,
                                  stdout=subprocess.DEVNULL)
  
      processes = [shellprocess(path) for path in paths]
  
      for process in processes:
          process.wait()