Modules

Question

How output is 6 for below :
def func(x):
res = 0
for i in range(x):
res += i
return res
print (func(4))

Answer 1

What does this have to do with Modules?
Please try to find a fitting title for your questions.
func is called with 4.
range(4) becomes 0, 1, 2, 3.
If you add all these numbers to res, it's six.