Iterator protocol in Python - Mini Project: Build & Apply

Iterator Protocol

📖 Scenario: You are working on a simple program that processes a list of fruits one by one. To do this, you will use Python's iterator protocol, which lets you manually get each item from a list.

🎯 Goal: Build a program that creates a list of fruits, gets an iterator for that list, manually retrieves each fruit using the iterator, and prints each fruit.

📋 What You'll Learn

Create a list called fruits with the exact items: 'apple', 'banana', 'cherry'

Create a variable called fruit_iterator that gets the iterator of the fruits list using the iter() function

Use the next() function to get each fruit from fruit_iterator and store them in variables first_fruit, second_fruit, and third_fruit

Print each fruit variable on its own line in the order they were retrieved

💡 Why This Matters

🌍 Real World

Iterators let programs handle data one piece at a time, which is useful when working with large files, streams, or user input step-by-step.

💼 Career

Understanding the iterator protocol is important for Python developers because many built-in functions and libraries use iterators to process data efficiently.

1

Create the list of fruits

Create a list called fruits with these exact items in order: 'apple', 'banana', 'cherry'

Python

# Create the list fruits with 'apple', 'banana', 'cherry'
# Your code here

Need a hint?

Use square brackets [] to create a list and separate items with commas.

2

Get an iterator for the fruits list

Create a variable called fruit_iterator and set it to the iterator of the fruits list using the iter() function

Python

fruits = ['apple', 'banana', 'cherry']
# Create fruit_iterator using iter() on fruits
# Your code here

Need a hint?

Use iter(fruits) to get the iterator.

3

Retrieve fruits using next()

Use the next() function to get each fruit from fruit_iterator and store them in variables first_fruit, second_fruit, and third_fruit in that order

Python

fruits = ['apple', 'banana', 'cherry']
fruit_iterator = iter(fruits)
# Use next() to get first_fruit, second_fruit, third_fruit
# Your code here

Need a hint?

Call next(fruit_iterator) three times and assign each result to the correct variable.

4

Print the fruits

Print the variables first_fruit, second_fruit, and third_fruit each on its own line in that order

Python

fruits = ['apple', 'banana', 'cherry']
fruit_iterator = iter(fruits)
first_fruit = next(fruit_iterator)
second_fruit = next(fruit_iterator)
third_fruit = next(fruit_iterator)
# Print each fruit on its own line
# Your code here

Need a hint?

Use three print() statements, one for each fruit variable.