CODEWITHSUNDEEP
pythonpython-3.x
python helper
python helper

Reputation: 3

Unsupported Operand int and str?

I am trying to add all the elements in a list but it keeps popping up with unsupported operand for int and string any idea? 

total_years = 0
for i in range(len(str(years_list))):
    total_years += str(years_list[i])
print(years_total)

if I use int it comes up with IndexError: list index out of range

Upvotes: 0

Views: 72

Answers (1)

Kevin
Kevin

Reputation: 76194

total_years is an integer and str(years_list[i]) is a string. You can't add a string to an integer.

When you use int instead, you get IndexError because you're iterating way past the end of years_list. The string representation of a list is typically much longer than the list's actual length. Ex. [1,2,3] has a length of 3, but str([1,2,3]) has a length of 9 because it counts the commas and brackets and spaces. Maybe you meant to do for i in range(len(years_list)).

You don't need any of this type-changing stuff anyway. If you want to add all the elements of a list, use sum.

total_years = sum(years_list)

Upvotes: 1

Related Questions