code: def setUp(self):
      comm = self.COMM
      world_size = MPI.COMM_WORLD.Get_size()
      world_rank = MPI.COMM_WORLD.Get_rank()
      prefix = self.prefix
      if comm.Get_size() < world_size:
          prefix += f"{world_rank}-"
      fname = None
      if comm.Get_rank() == 0:
          fd, fname = tempfile.mkstemp(prefix=prefix)
          os.close(fd)
      fname = comm.bcast(fname, 0)
      amode = MPI.MODE_RDWR | MPI.MODE_CREATE
      amode |= MPI.MODE_DELETE_ON_CLOSE
      amode |= MPI.MODE_UNIQUE_OPEN
      info = MPI.INFO_NULL
      try:
          self.FILE = MPI.File.Open(comm, fname, amode, info)
      except Exception:
          if comm.Get_rank() == 0:
              os.remove(fname)
          raise
  
imports: from mpi4py import MPI
  import mpiunittest
  import arrayimpl
  import os, tempfile
  import platform
label_desc: Use image node_id 1 for calling the BaseTestIO obj's underlying member method code with example usage: obj.setUp() without return types