code: def testPutProcNull(self):
      rank = self.COMM.Get_rank()
      with win_lock(self.WIN, rank):
          r = self.WIN.Rput(None, MPI.PROC_NULL, None)
          r.Wait()
  
imports: from mpi4py import MPI
  import mpiunittest
  import contextlib
  import arrayimpl
label_desc: Use image node_id 6 for calling the BaseTestRMA obj's underlying member method code with example usage: obj.testPutProcNull() without return types