Putting it together
- Python course
- Beginner
- Lesson 52/116
- 6 min
Combine the cart class with a menu loop.
Putting the cart together
In the final lesson we combine the cart. We'll add items, list them and compute the total:
cart = []
cart.append("Apple")
cart.append("Bread")
for item in cart:
print(item)
prices = [10, 20]
total = 0
for price in prices:
total += price
print("Total:", total)This is the skeleton of the cart app: adding, listing and total.
The complete cart
The full cart adds items to a list, iterates over them and sums the prices. This is the skeleton of a small e-commerce app:
cart = ["Apple", "Bread", "Milk"]
for item in cart:
print(item)
prices = [10, 20, 15]
total = 0
for price in prices:
total += price
print("Total:", total)This prints 'Apple', 'Bread', 'Milk' and 'Total: 45'.
Practice Complete the cart
Assign cart = ["Apple", "Bread", "Milk"]. Write for item in cart: print(item). Assign prices = [10, 20, 15] and total = 0. Write for price in prices: total += price. Then print print("Total:", total).
Starter code
# Complete the cartSample solution
cart = ["Apple", "Bread", "Milk"]
for item in cart:
print(item)
prices = [10, 20, 15]
total = 0
for price in prices:
total += price
print("Total:", total)Expected output
Apple Bread Milk Total: 45
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 What are the three steps of the cart app?
- Print, wait, exit
- Input, operation, output
- Add, list, total Correct answer
- Open, read, close
Explanation: The cart has adding, listing and total steps.
2 Print the total
print("Total:", ____)print("Total:", total)Explanation: print("Total:", total) prints the total.
3 Match the cart pieces
| Term | Meaning |
|---|---|
append |
Add an item |
for item in cart |
List items |
total += price |
Addition |
print(total) |
Print the total |