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请大神帮忙解答一道难题！！！

反向冒泡排序要求：插入十个20以内的随机数，并利用冒泡排序算法将它们由大到小地排列出来，并且输出到终端。

代码如下：

import random
import time

j = 0
i = 0
temp = 0
numbers = []
for x in range(10):
    numbers.append(random.randint(1, 20))

def MaoPaoPaiXu(Numbers):
    Y = False
    for i in range(len(numbers)):
        Y = True
        for j in range(len(numbers) - i - 1):
            if (numbers[j] < numbers[j + 1]):
                temp = numbers[j]
                numbers[j] = numbers[j + 1]
                numbers[j + 1] = temp
        if Y:
            break

start = time.time()
MaoPaoPaiXu(numbers)
useTime = time.time() - start
print('用了' + str(useTime) + '秒')
print(numbers)

start = time.time()
MaoPaoPaiXu(numbers)
useTime = time.time() - start
print('用了' + str(useTime) + '秒')
print(numbers)

请打神帮忙解答，我这是出了神马BUG，谢谢谢谢谢！！！

（工具：Visual Studio Code）