how

Question

What is the output of this code?
def func(x):
res = 0
for i in range(x):
res += i
return res
print(func(4))

the answer for this one is 6
i run it and found 6 but did not understandhow exactly
could you help guys???

Answer 1

res begins as 0, for each number in the range loop it will add the value for that iteration.
i begins at 0
i turns 1, res+i =0+1
i turns 2, res+i =1+2 (1 for the result in the last instance)
i turns 3, res+i =3+3, equals 6

Answer 2

Res+= i
Is the same thing as res + res= i
So if we ten the loop 4 times we get 6

Answer 3

still did not get it bro