Nested while loops in Python - Mini Project: Build & Apply

Nested while loops

📖 Scenario: You are helping a small bakery organize their daily baking schedule. They bake different types of bread in batches. Each batch has a fixed number of loaves. You want to print out the baking plan showing each batch and the loaves inside it.

🎯 Goal: Build a program that uses nested while loops to print the batch number and loaf number for each loaf baked.

📋 What You'll Learn

Create a variable batches with the value 3 representing the number of batches.

Create a variable loaves_per_batch with the value 4 representing loaves in each batch.

Use a nested while loop: the outer loop counts batches, the inner loop counts loaves.

Print the batch number and loaf number in the format: Batch 1, Loaf 1.

💡 Why This Matters

🌍 Real World

Bakers and factory workers often need to organize tasks in batches and steps, so nested loops help automate schedules and reports.

💼 Career

Understanding nested loops is essential for programming tasks that involve multi-level data or repeated actions inside other repeated actions, common in software development and automation.

1

Set up batch and loaf counts

Create a variable called batches and set it to 3. Create another variable called loaves_per_batch and set it to 4.

Python

# Create variables batches and loaves_per_batch
# Your code here

Need a hint?

Use simple assignment like batches = 3 and loaves_per_batch = 4.

2

Initialize batch counter

Create a variable called batch and set it to 1 to start counting batches.

Python

batches = 3
loaves_per_batch = 4
# Initialize batch counter
# Your code here

Need a hint?

Start counting batches from 1 using batch = 1.

3

Write nested while loops for batches and loaves

Write a while loop that runs while batch <= batches. Inside it, create a variable loaf set to 1. Then write another while loop inside that runs while loaf <= loaves_per_batch. Inside the inner loop, print Batch {batch}, Loaf {loaf} using an f-string, then increase loaf by 1. After the inner loop ends, increase batch by 1.

Python

batches = 3
loaves_per_batch = 4
batch = 1
# Write nested while loops to print batches and loaves
# Your code here

Need a hint?

Remember to reset loaf to 1 inside the outer loop before the inner loop starts.

4

Run the program to see the baking plan

Run the program to print the baking plan showing each batch and loaf number as Batch 1, Loaf 1 up to Batch 3, Loaf 4.

Python

batches = 3
loaves_per_batch = 4
batch = 1
while batch <= batches:
    loaf = 1
    while loaf <= loaves_per_batch:
        print(f"Batch {batch}, Loaf {loaf}")
        loaf += 1
    batch += 1
# Run the program to see the output

Need a hint?

Check that the output lists all batches and loaves correctly.