output of code (py)

Question

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

print(func(4))

output of this code is 6 and please help me to understand why..

Answer 1

What result did you want to get?

Answer 2

You added all the integers in a range object to variable res.
range(4) = 0, 1, 2, 3
res = 0+1+2+3=6

res was returned as 6, and 6 was printed.