32.2 Let’s go shopping practice help

Question

So lost. I’m not finding that the lessons prior are aligned to the practice, and with little direction from the app too.

cart = [15, 42, 120, 9, 5, 380]

discount = int(input())
total = 0
for cart in cart:
total = cart - (cart * discount/100)
print(total)

You’re making a shopping cart program.

The shopping cart is declared as a list of prices, and you need to add functionality to apply a discount and output the total price.

Take the discount percentage as input, calculate and output the total price for the shopping cart.

Use a for loop to iterate over the list.
Use the following formula to calculate the result of X% discount on $Y price: Y - (Y*X/100)

Answer 1

You can't say

for cart in cart:

It has to be

for item in cart:

Also, you are printing the total for each item. What you need to do is sum each of the totals and print the final sum at the end.

Just keep persevering. It will all become clearer the more you practice, I promise.

Answer 2

This took me a while to solve as each line would print a total not just a final one. Here's what worked for me.

cart = [15, 42, 120, 9, 5, 380]

discount = int(input())
total = 0
for item in cart:
total+=item-(item*(discount/100))
else:
print(total)

Answer 3

From the sentence "output the total price for the shopping cart", I think you need to output the sum of the cart which each item is discounted.

Try += instead of = in the for loop, and get the print(total) out of the for loop to output the total price only once.

Answer 4

item gets defined separately for each iteration of the loop.

cart = [15, 42, 120, 9, 5, 380]
for item in cart:

On the first iteration, item takes the value 15, on the second iteration, item becomes 42, and so on.

So you don't need to define item beforehand. It gets defined within the loop.

Answer 5

thanks CarrieForle. the combo of those worked. here is the code. but how does it work without item being defined? Russ

cart = [15, 42, 120, 9, 5, 380]

discount = int(input())
total = 0
for item in cart:
total += item - (item * discount/100)
print(total)

Answer 6

c=[15,42,120,9,5,380]
d=int(input())
t=0
for i in c:
t+=i*(1-d/100)
print(t)

Hope this helps!

Answer 7

For those of you getting more than one output. If you are indenting print(total) it is part of the for loop. Do not indent it and it just output the total of all items since it will not be part of the loop.

Answer 8

I got a big problem. Why do I get every iteration in total rather than the total of the whole set of item?

cart = [15, 42, 120, 9, 5, 380]

discount = int(input())
total = 0

for item in cart:
total += item - (item * discount/100)
print(total)

Output:

Enter a number:
12
13.2
50.16
155.76
163.67999999999998
168.07999999999998
502.47999999999996

Answer 9

cart = [15, 42, 120, 9, 5, 380]

discount = int(input())
total = sum(cart)

for item in cart:
total -= item * discount/100
print(total)

Answer 10

Thanks for all of the helpful comments. I solved it, but I didn't use a for statement. Which to me is somehow more disappointing than not solving it at all. Here was my initial solution:

cart = [15, 42, 120, 9, 5, 380]

discount = int(input())
total = sum(cart)

x = total - ((total * discount) / 100)

print(x)

Answer 11

cart = [15, 42, 120, 9, 5, 380]

discount = int(input())
total = 0
for item in cart:
total+=(item*discount/100)
else:
print(total)
for the first case, it works but for the rest, It doesn't can anyone tell why.

Answer 12

cart = [15, 42, 120, 9, 5, 380]

discount = int(input())
total = sum(cart)

for item in cart:
total -= (item * (discount/100))
print(total)

This works for all but the 4th test case and I don't know why. Any ideas?

Answer 13

cart = [15, 42, 120, 9, 5, 380]

discount = int(input())

total = 0
for i in cart:
total += i
print (total-(total*discount/100))

#this works just fine for all

Answer 14

what i did is that i declared a different variable for item - (item * discount/100)}
part as amount i.e.

cart = [15, 42, 120, 9, 5, 380]

dis = float(input("Enter Discount"))
amount = 0
total = 0

for item in shoplist:
amount = item - discount/100 * item
total += amount
print(total)

and it worked fine, so hope it helps.

Answer 15

cart = [15, 42, 120, 9, 5, 380]
discount = int(input())
total= sum(cart)
a = total-((total*discount/100))
print(a)

Answer 16

cart = [15, 42, 120, 9, 5, 380]

discount = int(input())
total = 0

for x in cart:
total += x-(x*discount/100)
print(total)

Answer 17

You can try this

cart = [15, 42, 120, 9, 5, 380]

x = float(input())
total = 0
for cart in cart:
calc = cart - (cart * x/100)
total += calc
print(total)