Peek Front Element of Queue in DSA Python - Build from Scratch

Peek Front Element of Queue

📖 Scenario: You are managing a line of customers waiting to buy tickets at a counter. The line is a queue where the first person to arrive is the first to be served.

🎯 Goal: Build a simple queue using a list and learn how to peek at the front customer without removing them from the line.

📋 What You'll Learn

Create a queue with exact customers in order

Add a variable to hold the front element

Access the front element without removing it

Print the front element

💡 Why This Matters

🌍 Real World

Queues are used in real life to manage lines, like customers waiting for service or tasks waiting to be processed.

💼 Career

Understanding queues and how to peek at elements is important for software development, especially in areas like task scheduling, messaging systems, and resource management.

1

Create the queue with customers

Create a list called queue with these exact customers in order: 'Alice', 'Bob', 'Charlie', 'Diana'

DSA Python

# Create the queue list with customers
# Your code here

Hint

Use square brackets to create a list and separate names with commas.

2

Add a variable to hold the front element

Create a variable called front_customer and set it to the first element of the queue list using index 0

DSA Python

queue = ['Alice', 'Bob', 'Charlie', 'Diana']
# Set front_customer to the first element of queue
# Your code here

Hint

Use queue[0] to get the first item in the list.

3

Access the front element without removing it

Use the variable front_customer to hold the front element of the queue without removing it. (This is already done in the previous step.)

DSA Python

queue = ['Alice', 'Bob', 'Charlie', 'Diana']
front_customer = queue[0]
# Confirm front_customer holds the first element
# Your code here

Hint

You already have the front element stored in front_customer.

4

Print the front element

Print the value of the variable front_customer to show the front element of the queue

DSA Python

queue = ['Alice', 'Bob', 'Charlie', 'Diana']
front_customer = queue[0]
# Print the front_customer
# Your code here

Hint

Use print(front_customer) to display the front customer.