code: def julia_line(k):
      line = bytearray(w)
      y = y1 - k * dy
      for j in range(w):
          x = x0 + j * dx
          line[j] = julia(x, y)
      return line
  
imports: import sys
  import time
  from mpi4py.futures import MPICommExecutor
label_desc: Use image node_id 2 for calling a global function with example usage: julia_line(k) and returns: line