冒泡排序

def bubble_sort(nums):

   n = len(nums)

   for i in range(n-1):

       for j in range(n-i-1):

           if nums[j] > nums[j+1]:

               nums[j], nums[j+1] = nums[j+1], nums[j]

nums = [5, 3, 8, 2, 1]

print("排序前：", nums)

bubble_sort(nums)

print("排序后：", nums)