I wrote a function (shopping list) which calculates the total price of the purchase (quantity * price) as well as the stock change (stock - quantity). I know the latter is imperfect (my function does not take into account if items are out of stock for example, but that's my next challenge. The function does exactly what it's supposed to do:
def shopping(quantity, price, stock): total = 0 for key in quantity: total += quantity[key] * price[key] stock_update = stock[key] - quantity[key] print(stock_update) print(total) quantity = { "bapple": 10, "banana": 20 } price = { "bapple": 5, "banana": 3 } stock = { "bapple": 20, "banana": 50 } shopping(quantity, price, stock) Now, I want to print the item next to the stock update, and I am receiving an error message. I couldn't figure out how to fix that: def shopping(quantity, price, stock): total = 0 for key, value in quantity.items(): total += quantity[value] * price[value] stock_update = stock[value] - quantity[value] print(key, stock_update) print(total) quantity = { "bapple": 10, "banana": 20 } price = { "bapple": 5, "banana": 3 } stock = { "bapple": 20, "banana": 30 } shopping(quantity, price, stock) _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor