找出最大的数字
找出最小的数字
比较这两个数字
给定一组指令，使用编程语言编写函数
def find_largest_and_smallest_numbers(numbers):
    largest_number = 0
    smallest_number = numbers[0]
    for number in numbers:
        if number > largest_number:
            largest_number = number
        elif number < smallest_number:
            smallest_number = number
    return largest_number, smallest_number