Reply-to queue pattern in RabbitMQ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a temporary reply queue in RabbitMQ.

RabbitMQ

channel.queue_declare(queue=[1], exclusive=True)

Drag options to blanks, or click blank then click option'

A""

B"main_queue"

C"reply_queue"

D"task_queue"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a fixed queue name instead of an empty string.

Not setting the queue as exclusive.

Using an empty string "" tells RabbitMQ to create a unique, exclusive, and temporary queue for replies.

2fill in blank

medium

Complete the code to set the reply_to property in the message properties.

RabbitMQ

channel.basic_publish(exchange='', routing_key='task_queue', properties=pika.BasicProperties(reply_to=[1]), body='Hello')

Drag options to blanks, or click blank then click option'

A"main_queue"

B"callback_queue"

Ccallback_queue

Dreply_queue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a quoted string literal instead of the variable.

Using the wrong queue name.

The reply_to property should reference the callback_queue variable containing the reply queue name. No quotes are needed as it is already a string variable.

3fill in blank

hard

Fix the error in the callback function to correctly acknowledge the message.

RabbitMQ

def on_response(ch, method, props, body):
    if props.correlation_id == corr_id:
        response = body
    ch.basic_ack([1])

Drag options to blanks, or click blank then click option'

Amethod.delivery_tag

Bprops.delivery_tag

Cbody.delivery_tag

Dch.delivery_tag

Attempts:

3 left

💡 Hint

Common Mistakes

Using properties or channel instead of method for delivery tag.

Not acknowledging the message at all.

The basic_ack method requires the delivery tag from the method parameter to acknowledge the message.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps words to their lengths only if length is greater than 3.

RabbitMQ

{word: [1] for word in words if [2] > 3}

Drag options to blanks, or click blank then click option'

Alen(word)

Cword

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself instead of its length.

Checking the word instead of its length in the condition.

The dictionary comprehension maps each word to its length using len(word) and filters words with length greater than 3.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase keys to values only if value is positive.

RabbitMQ

result = { [1]: [2] for k, v in data.items() if v [3] 0 }

Drag options to blanks, or click blank then click option'

Ak.upper()

Bv

C>

Dk.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase keys instead of uppercase.

Using wrong comparison operators.

Swapping keys and values.

The comprehension uses k.upper() as keys, v as values, and filters values greater than zero.