code: def test_julia():
      with MPICommExecutor() as executor:
          if executor is None:
              return  # worker process
          tic = time.time()
          image = list(executor.map(julia_line, range(h), chunksize=10))
          toc = time.time()
  
      print(
          "%s Set %dx%d in %.2f seconds." % ("Julia", w, h, toc - tic)
      )
      if len(sys.argv) > 1 and sys.argv[1] == "-plot":
          plot(image)
  
imports: import sys
  import time
  from mpi4py.futures import MPICommExecutor
label_desc: Use image node_id 4 for calling a global function with example usage: test_julia() without return types