Python TypeError: 'int' object is not iterable when summing a list of integers

Question

I'm trying to sum up a list of numbers from the list but for some reason it just kept showing TypeError, can somebody tell me why and how I can fix it?

portfolio = [('AAPL',5, 140),('FB',3, 330)]

for i in portfolio:
    sum_value = 0
    stocks  = list (i)
    item_value = stocks[1] * stocks[2]
    print(sum(item_value))



---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-56-5825164afaac> in <module>
      5     stocks  = list (i)
      6     item_value = stocks[1] * stocks[2]
----> 7     print(sum(item_value))
      8 
      9 

TypeError: 'int' object is not iterable

item_value is an integer, you can not use the sum() function on only one integer. Could you show the expected output? — Silveris
– Silveris, Commented Oct 13, 2021 at 14:41
item_value contains the result of stocks[1] * stocks[2]. So it's just an integer. — itismoej
– itismoej, Commented Oct 13, 2021 at 14:42
The expected output for the codes should be like this, [in]: portfolio_value([('AAPL',5, 140),('FB',3, 330)]) [out]: 1690 — Ethan Pan
– Ethan Pan, Commented Oct 13, 2021 at 14:48
The expected output for the codes should be: when the function takes inputs for both portfolios, the output should be the sum of each portfolio value, for AAPL, it would be 700, FB would be 990 and the expected output would be sum of both numbers which is 1690 — Ethan Pan
– Ethan Pan, Commented Oct 13, 2021 at 15:26

Guinther Kovalski · Accepted Answer · 2021-10-13 14:49:47Z

2

sum expects a iterable object, like a list, while you are passing just a single value.

you can solve this with:

sum_value = 0
for i in portfolio:
    stocks  = list (i) #if i is a tuple there is no need for this conversion
    sum_value += stocks[1] * stocks[2]
print(sum_value)

or in a single line:

sum([item[1]*item[2] for item in portfolio])

edited Oct 13, 2021 at 14:49

answered Oct 13, 2021 at 14:42

Guinther Kovalski

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1 Comment

LeelaPrasad Over a year ago

Tuples are indexed, so they can be accessed similar to lists. So there is no need to convert it into list for stocks in portfolio: sum_value += stocks[1] * stocks[2] this should make this even simple.

sushant · Accepted Answer · 2021-10-13 15:01:14Z

1

You can use generator expressions and pattern matching on tuples to simplify the code

print(sum(item_value*stock_value for (_,item_value,stock_value) in portfolio))

edited Oct 13, 2021 at 15:01

answered Oct 13, 2021 at 14:47

sushant

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1 Comment

sushant Over a year ago

@Sayse that's generator expression and pattern matching on tuples. You're right!

貓村幻影 · Accepted Answer · 2021-10-13 14:42:37Z

0

Do you mean something like this?

portfolio = [('AAPL', 5, 140), ('FB', 3, 330)]

item_sum = 0

for i in portfolio:
    sum_value = 0
    stocks = list(i)
    item_value = stocks[1] * stocks[2]
    item_sum += item_value
print(item_sum)

In your code, item_value is an int but not a list, it can't be in sum() What you need to do is declare a variable to save and add value to it.

answered Oct 13, 2021 at 14:42

貓村幻影

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1 Comment

Ethan Pan Over a year ago

I tried this method but it only returned the sum of each single stock (700 and 990), they still wouldn't add up tot he sum.

WhiteAB · Accepted Answer · 2021-10-13 14:42:46Z

-1

the error is because you are passing a int value into the function sum you must pass a list like this

sum([3,4])

and the result is 7

you should use something like this

portfolio = [('AAPL',5, 140),('FB',3, 330)]

for i in portfolio:
    sum_value = 0
    stocks  = list (i)
    item_value = stocks[1] * stocks[2]
    print(sum([sum_value,item_value]))

answered Oct 13, 2021 at 14:42

WhiteAB

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