How many in range?

Write count_between(n, low, high) returning how many of the numbers 1 to n lie between low and high inclusive — without looping over them.

Clip the range to 1…n first; then it is just a subtraction.

def count_between(n, low, high):
    count = 0
    for x in range(1, n + 1):
        if low <= x <= high:
            count += 1
    return count

Run adds print(count_between(10, 3, 5)) after your code, to try it.

Stuck on the idea rather than the code? The Two pointers and formulas lesson walks through it.