Find None in a List

Create a function to find None in a list of numbers. The return value should be the index where None is found. If None is not found in the list, then return -1.

Examples

find_none([1, 2, None]) ➞ 2

find_none([None, 1, 2, 3, 4]) ➞ 0

find_none([0, 1, 2, 3, 4]) ➞ -1

Notes

None will occur in the input list only once.