Work queue for task distribution in RabbitMQ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a durable queue named 'task_queue'.

RabbitMQ

channel.queue_declare(queue='task_queue', durable=[1])

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

ANone

BFalse

CTrue

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Setting durable to False causes the queue to be deleted on server restart.

Setting durable=True makes the queue survive RabbitMQ restarts, which is important for work queues.

2fill in blank

medium

Complete the code to send a persistent message to the 'task_queue'.

RabbitMQ

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

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

A1

B2

C0

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using delivery_mode=1 sends non-persistent messages.

Setting delivery_mode=2 marks the message as persistent, so it won't be lost if RabbitMQ restarts.

3fill in blank

hard

Fix the error in the consumer code to acknowledge messages manually.

RabbitMQ

channel.basic_consume(queue='task_queue', on_message_callback=callback, auto_ack=[1])

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

ANone

BTrue

C0

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Setting auto_ack to True causes messages to be lost if the consumer crashes.

Setting auto_ack=False means the consumer will send an acknowledgment after processing each message, which is important for work queues.

4fill in blank

hard

Fill both blanks to set prefetch count to 1 and declare a durable queue.

RabbitMQ

channel.basic_qos(prefetch_count=[1])
channel.queue_declare(queue='task_queue', durable=[2])

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

A1

B0

CTrue

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using prefetch_count=0 disables fair dispatch, and durable=False makes the queue temporary.

Setting prefetch_count=1 tells RabbitMQ not to give more than one message to a worker at a time. Declaring the queue as durable ensures it survives restarts.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps each word to its length only if length is greater than 3.

RabbitMQ

lengths = { [1] : [2] for [3] in words if len([3]) > 3 }

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

Aword

Blen(word)

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in different parts of the comprehension.

This comprehension creates a dictionary where keys are words and values are their lengths, but only for words longer than 3 characters.