# 11/13 Making a Purchase

#1

https://www.codecademy.com/courses/learn-python/lessons/a-day-at-the-supermarket/exercises/making-a-purchase?action=lesson_resume

compute_bill([‘apple’]) resulted in a TypeError: unsupported operand type(s) for +=: ‘int’ and ‘list’

I’ve tried following the instructions and doing a bit of reiteration, but it has done little. Could anyone shed light on this matter?

``````shopping_list = ["banana", "orange", "apple"]

stock = {
"banana": 6,
"apple": 0,
"orange": 32,
"pear": 15
}

prices = {
"banana": 4,
"apple": 2,
"orange": 1.5,
"pear": 3
}

# Write your code below!
def compute_bill(food):
total = 0
for x in food:
total += food
return total``````

#2

`food` is a list, maybe adding a function call will clarify what `food` is:

``````def compute_bill(food):
total = 0
for x in food:
total += food
return total

print compute_bill(shopping_list)
``````

now, `food` (list) + total (integer) results in an error, we need to add the price (we could use the prices dictionary for this) of each item (loop) in food list to total

#3

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