code: def main_child():
      icomm = MPI.Comm.Get_parent()
      assert icomm != MPI.COMM_NULL
      worker(icomm)
      icomm.Disconnect()
  
file_path: mpi4py/demo/compute-pi/cpi-dpm.py
imports: import sys
  from mpi4py import MPI
  import numpy
label_desc: Use image node_id 7 for calling a global function with example usage: main_child() without return types