When we execute the code

for i in range(10,0,-1):
    print('''          ''',i)

We get the result as 10 to 1(including 1) But we do know that stop value is always n-1. So shouldn't it come until -1. Or does n-1 depend on the step value? Like if positive step value comes then n-1 and when negative step value comes n 2.

CodePudding user response：

Stop value is not n-1 but it is n-step, and your step = -1 So,

Stop value = n - step = 0 - (-1) = 1

CodePudding user response：

From the Python documentation

class range(start, stop[, step])

<snip>

For a positive step, the contents of a range r are determined by the formula r[i] = start step*i where i >= 0 and r[i] < stop.

For a negative step, the contents of the range are still determined by the formula r[i] = start step*i, but the constraints are i >= 0 and r[i] > stop.

So, in case of range(10,0,-1) the return values all have to be bigger than 0.