gistfile1.txt

def find_last(search, target):
    pos = 0
    position = search.find(target)
    if position < 0:
        return position
    else:
        while position >= 0:
            first_pos = search.find(target)
            position = search.find(target, first_pos + pos)
            pos = pos + 1
            if position < 0:
                break
                return position
            else:
                final_pos = search.find(target, position)
        return final_pos