Your question is Debugging With Programming Errors. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
NCR builds point-of-sale software for retail chains, and a store group has reported that loyalty discounts are being calculated incorrectly at checkout. The function below is pulled from the discount engine that runs on every transaction in the pilot store.
def apply_discounts(cart_items, loyalty_tier, coupon_code):
total = 0
discount_pct = 0
if loyalty_tier = "gold":
discount_pct = 0.15
elif loyalty_tier == "silver":
discount_pct = 0.10
for item in cart_items:
total += item.price
if coupon_code == "SAVE10":
total -= total * 0.10
discounted_total = total - (total * discount_pct)
print("Final total: " + discounted_total)
return discounted_total
Each cart item has a price and a quantity attribute. Find the 5 programming errors in this function, including at least one that would stop it from running at all and one that would only show up later as a subtle accounting problem. Explain what happens at runtime for each one.