[Python] I don't know what is wrong with my solution for leet code problem-148 (Sort List)...

class Solution(object):
def sortList(self, head):
"""
:type head: Optional[ListNode]
:rtype: Optional[ListNode]
"""
def sort(l):
n=len(l)
for i in range(n):
for j in range(0,n-i-1):
if l[j]>l[j+1]:
l[j],l[j+1]=l[j+1],l[j]
return l


I tried to use bubble sorting for the solution. It worked on my python editor but somehow not working in leet code website.

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