Bubble Sort Python sorting only once

Question

Can anyone help me in identifying the error in this program for bubble sort?

def bsort(a):
    for i in range (0, len(a)-1):
        for j in range(i):
            if a[j]> a[j+1]:
                temp = a[j]
                a[j] = a[j+1]
                a[j+1] = temp

num = [1,2,6,5,7,2,5,9]
bsort(num)
print(num)

It sorts the list only once.

Answer 1

更改外循环中的范围：

for i in range (0, len(a)):

Answer 2

Minor issues in for loop.

def bsort(a):
    for i in range (0, len(a)-1):
        for j in range(len(a)-2): ## updated here
            if a[j]> a[j+1]:
                temp = a[j]
                a[j] = a[j+1]
                a[j+1] = temp

num = [1,2,6,5,7,2,5,9]
bsort(num)
print(num)

Output is [1, 2, 2, 5, 5, 6, 7, 9]