explanation

Question

hello all,
can anyone explain why the output is 28. I thought the output would be the sum of all
the characters in list.

list = [4,6,8,3,7,9,5,3,]
sum = 0
for a in range(len(list)):
sum = sum + a
print(sum)

Answer 1

There is no need to use range in the for loop here. And you should try to avoid using names like list for a variable name.

lst = [4,6,8,3,7,9,5,3,]
sum = 0
for a in lst:
sum = sum + a
print(sum)

Answer 2

a is always the number in the range, and you're adding that.

Write:

sum = sum + list[a]

Answer 3

len(list) returns the length of the list. Just simply use for a in list and it will be good.

Btw, for loop in Python is like foreach loop in other languages