code: def sayhello(comm):
      comm_ptr = MPI._addressof(comm)
      comm_val = MPI_Comm.from_address(comm_ptr)
      _lib.sayhello(comm_val)
  
imports: from mpi4py import MPI
  import ctypes
  import os
label_desc: Use image node_id 1 for calling a global function with example usage: sayhello(comm) without return types