Ensuring message delivery with the mandatory flag

The following example demonstrates how to check if a message is delivered by setting the mandatory flag and handling exceptions when using the BlockingConnection:

import pika
import pika.exceptions

# Open a connection to RabbitMQ on localhost using all default parameters
connection = pika.BlockingConnection()

# Open the channel
channel = connection.channel()

# Declare the queue
channel.queue_declare(queue="test", durable=True, exclusive=False, auto_delete=False)

# Enabled delivery confirmations. This is REQUIRED.
channel.confirm_delivery()

# Send a message
try:
    channel.basic_publish(exchange='test',
                          routing_key='test',
                          body='Hello World!',
                          properties=pika.BasicProperties(content_type='text/plain',
                                                          delivery_mode=1),
                          mandatory=True)
    print('Message was published')
except pika.exceptions.UnroutableError:
    print('Message was returned')