Python question

Question

Why does the following:

def func(x):
res = 0
for i in range(x):
res += i
return res

Print(func(4))

result in 6. I thought it was 4. Can someone explain?

Answer 1

range(4) => 0,1,2,3

0 + 1 + 2 + 3 = 6

Step by step (Loop)

1) res = 0 + 0 #res = 0
2) res = 0 + 1 #res = 1
3) res = 1 + 2 #res = 3
4) res = 3 + 3 #res = 6

Answer 2

Thank you so much! I really appreciate it

Answer 3

You are welcome