this code doesn’t work. im not sure why.it doesn’t show any error messange. I put the code and output message

def insertionSort(arr):
    n = len(arr)

    if n <= 1 :
        return

    for i in range(1, n):
        key = arr[i]
        j = i-1
        while j >= 0 and key < arr[j]:
            arr [j+1] = arr[j]
            j = 1

        arr [j+1] = key

    arr = [12, 11, 14, 34, 23, 52]
    insertionSort(arr)
    print (arr)

this is output

C:UsersacerAppDataLocalProgramsPythonPython39python.exe D:PyCharmProjectproject1.py 

Process finished with exit code 0 

I expect this code to sort the list [12, 11, 14, 34, 23, 52] in ascending order