Exercise 7-6 Solution Python Crash Course Chapter 7 : User Input And While Loops

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📘 Python Crash Course – Chapter 7: User Input And while loops – Exercise 7-6 Solution

Welcome to another solution from Python Crash Course by Eric Matthes.

📝 Exercise 7-6

Task:
Write different versions of either Exercise 7-4 or Exercise 7-5 that do each of the following at least once:
• Use a conditional test in the while statement to stop the loop .
• Use an active variable to control how long the loop runs .
• Use a break statement to exit the loop when the user enters a 'quit' value

✅ Solution Code:


# exercise 7-4
# Pizza Toppings
total_toppings = 0 #total number of toppings

while total_toppings < 5: #conditional test in the while statement to stop the loop

    topping = input("Enter a pizza topping (or 'quit' to finish): ")
    if topping.lower() == 'quit':  #break the loop
        break 
    else:
        print(f"Adding {topping} to your pizza.")
    total_toppings += 1 #increment the number of toppings

🧠 Code Explanation:

  1. Initialize a counter variable:

    The variable total_toppings is initialized to 0. This variable keeps track of the total number of toppings added and acts as an active variable to control the loop's duration.

  2. Set a conditional test in the while loop:

    The while loop runs as long as total_toppings is less than 5. This condition ensures that the loop stops automatically after five toppings have been added.

  3. Check for the quit condition:

    An if statement checks whether the user entered 'quit'. The lower() method ensures the comparison is case-insensitive. If the user enters 'quit', the break statement is executed, which immediately exits the loop.

  4. Handle valid toppings:

    If the user enters a valid topping (anything other than 'quit'), the program acknowledges the topping and increments the total_toppings counter by 1. This ensures the loop progresses toward its stopping condition.

🔍 Output:


Enter a pizza topping (or 'quit' to finish): wheat 
Adding wheat to your pizza.
Enter a pizza topping (or 'quit' to finish): cabbage
Adding cabbage to your pizza.
Enter a pizza topping (or 'quit' to finish): papaya
Adding papaya to your pizza.
Enter a pizza topping (or 'quit' to finish): quit

📚 Related Exercises from Chapter 7:

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