what is a bubble sort in python wikipedia code example

Example 1: bubble sort in python

def bubble_sort(arr):
    x=-1
    n=len(arr)#length of array 6
    for i in range (0,n):
        for j in range(1,n-i):
            if arr[j-1]>arr[j]:
                arr[j-1],arr[j]=arr[j],arr[j-1]
        if (n-i)<=1:
            break
    return arr
            
if "__main__"==__name__:
    arr=[7,1,2,6,9,3,8,4]
    result=bubble_sort(arr)
    print(result)

Example 2: bubble sort in python

def bubbleSort(lis):
    length = len(lis)
    for i in range(length):
        for j in range(length - i):
            a = lis[j]
            if a != lis[-1]:
                b = lis[j + 1]
                if a > b:
                    lis[j] = b
                    lis[j + 1] = a
    return lis