code: def test_pool_worker_lifetime_early_close(self):
      p = self.Pool(1)
      results = []
      for i in range(5):
          results.append(p.apply_async(sqr, (i, TIMEOUT1)))
      p.close()
      p.join()
      for j, res in enumerate(results):
          self.assertEqual(res.get(), sqr(j))
  
imports: from mpi4py import MPI
  import mpi4py.util.pool
  import concurrent.futures
  import itertools
  import functools
  import warnings
  import unittest
  import time
  import sys
  import os
label_desc: Use image node_id 20 for calling the BaseTestPool obj's underlying member method code with example usage: obj.test_pool_worker_lifetime_early_close() without return types