Python: function, for loop, error message

Question

I am pretty new to Python and am practicing with codeacademy, am getting a strange error message with below function. I dont understand as it looks logically and syntactically correct to me, can anyone see the issue?

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

Oops, try again.

compute_bill(['apple'])

resulted in a

TypeError: unsupported operand type(s) for +: 'int' and 'str'

Yes, 0 + 'apple' is not a meaningful operation in Python. You can only add numbers or concatenate strings, not add strings to numbers. — Frédéric Hamidi
– Frédéric Hamidi, Commented Oct 9, 2015 at 9:52

Rilwan · Accepted Answer · 2015-10-09 10:35:51Z

1

You cannot add a string with an integer . typeError on python Docs -typeError

call the function like below-

compute_bill([1]) 
compute_bill([10,20,30])

OR

apple = 10
orange = 20
compute_bill([apple,orange])

answered Oct 9, 2015 at 10:35

Rilwan

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saikumarm · Accepted Answer · 2015-10-09 10:51:34Z

1

as @Rilwan said in his answer yo cannot add string with an interger. Since you are working on codeacademy, i have completed similar assignment, I believe you have to get the cost of the food that you send to the function from a dictionary and then calculate the total.

food_cost = { "apples" : 20, "oranges" : 40}
def compute_bill(food):
     total = 0
     for item in food:
         total = total + food_cost[item]
     return total
compute_bill(['apples'])

answered Oct 9, 2015 at 10:51

saikumarm

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