old_contents: from multiprocessing.pool import ThreadPool
  
  def mt_map(func, iterable):
      thread_pool = ThreadPool()
      result      = thread_pool.map(func, iterable)
      thread_pool.close()
      thread_pool.join()
      return result
  
new_contents: from multiprocessing.pool import ThreadPool
  
  def mt_map(func, iterable):
      # thread_pool = ThreadPool()
      # result      = thread_pool.map(func, iterable)
      # thread_pool.close()
      # thread_pool.join()
      result = map(func, iterable)
      return result
  
subject: Disable multithreading