old_contents: def run(seed):
      """ function to run
  
      Args:
          seed: The value of each line striped in seed file
  
      Returns:
          String, object, list, directory, etc.
      """
  
      name, age = seed.split(',')
      return 'Hello World! {}, {}'.format(seed, int(age))
  
  
  def callback(result):
      """ callback function to call
      
      Args:
          result: ProcessTask instance pool_task_with_timeout() method returned
  
          result = {
              'seed': 'Jone',
              'data': 'Hello World! Jone',
              'exception': None
          }
  
          or 
  
          result = {
              'seed': 'Jone',
              'data': None,
              'exception': 'ValueError: invalid literal'
          }
  
      Returns:
          Anything want to return.
      """
  
      seed = result['seed']
      data = result['data']
      exception = result['exception']
  
      print('seed: "{}", data: "{}", exception: "{}"'
            .format(seed, data, exception))
  
new_contents: import time
  
  
  def run(seed):
      """ function to run
  
      Args:
          seed: The value of each line striped in seed file
  
      Returns:
          String, object, list, directory, etc.
      """
  
      name, age = seed.split(',')
      return 'Hello World! {}, {}'.format(seed, int(age))
  
  
  def callback(result):
      """ callback function to call
  
      Args:
          result: ProcessTask instance pool_task_with_timeout() method returned
  
          result = {
              'seed': 'Jone',
              'data': 'Hello World! Jone',
              'exception': None
          }
  
          result = {
              'seed': 'Jone',
              'data': None,
              'exception': 'ValueError: invalid literal'
          }
  
      Returns:
          Anything want to return.
      """
  
      seed = result['seed']
      data = result['data']
      exception = result['exception']
      time.sleep(0.05)
  
      print('seed: "{}", data: "{}", exception: "{}"'
            .format(seed, data, exception))
  
subject: Add time.sleep(0.05) in test module