old_contents: #
  # Sends a request to call hello() from within a worker.
  #
  
  import sys
  
  from tasks import hello
  
  if __name__ == '__main__':
      if len(sys.argv) != 3:
          print('usage: {} NAME AGE'.format(sys.argv[0]))
          sys.exit(1)
  
      # By calling hello.delay(), we request hello() to be executed in a worker
      # rather than executing it directly in the current process, which is what a
      # direct call to hello() would do.
      # http://docs.celeryproject.org/en/latest/userguide/calling.html
      hello.delay(sys.argv[1], int(sys.argv[2]))
  
new_contents: #
  # Sends a request to call hello() from within a worker.
  #
  
  import sys
  
  from tasks import hello
  
  if __name__ == '__main__':
      if len(sys.argv) != 3:
          print('usage: {} NAME AGE'.format(sys.argv[0]))
          sys.exit(1)
  
      # By calling hello.delay(), we request hello() to be executed in a worker
      # rather than executed directly in the current process, which is what a
      # call to hello() would do.
      # http://docs.celeryproject.org/en/latest/userguide/calling.html
      hello.delay(sys.argv[1], int(sys.argv[2]))
  
subject: Fix the phrasing in a comment.