old_contents: import argparse
  import pika
  
  
  def send_message(queue, body=None):
      """
      Sends a message to the specified queue with specified body if applicable.
  
      :param queue: Name of queue.
      :type queue: str
      :param body: Content of message body in the form "{'key': 'value'}".
      :type body: str
      """
      connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
      channel = connection.channel()
  
      channel.queue_declare(queue=queue)
  
      channel.basic_publish(exchange='', routing_key=queue, body=body)
      print(" [x] Message sent.")
      print(" Queue: {0}".format(queue))
      print(" Body: {0}".format(body))
  
      connection.close()
  
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser(description='Send a message to the '
                                                   'specified queue.')
      parser.add_argument('-q', '--queue', required=True,
                          help='The destination of the message')
      parser.add_argument('-b', '--body', help='The message body, if applicable.')
      args = parser.parse_args()
  
      send_message(args.queue, args.body)
new_contents: import amqp
  from time import sleep
  
  
  def callback(message):
      print(" [x] Received '{0}'. Sleeping...".format(message.body))
      sleep(10)
  
  
  connection = amqp.Connection()
  channel = connection.channel()
  channel.queue_declare(queue='hello')
  
  message = amqp.Message('Hello, world!')
  channel.basic_publish(message, exchange='', routing_key='hello')
  print(' [x] Sent: {0}'.format(message.body))
  
  connection.close()
  
subject: Add initial producer