code: def launcher(np):
      mpiexec = find_mpiexec()
      python = shlex.quote(sys.executable)
      if "coverage" in sys.modules:
          python += " -m coverage run -p"
      module = "mpi4py.run -rc threads=False"
      command = f"{mpiexec} -n {np} {python} -m {module}"
      return shlex.split(command)
  
imports: import sys
  import os
  import shlex
  import shutil
  import warnings
  import subprocess
  import unittest
  import mpi4py
label_desc: Use image node_id 3 for calling a global function with example usage: launcher(np) and returns: shlex