leetcode 206 python

class Solution:
    def reverseList(self, head: ListNode) -&gt; ListNode:
        if not head or not head.next:
            return head
        pre,tmp=None,None
        while(head):
            tmp=head.next
            head.next=pre
            pre=head
            head=tmp
        return pre

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leetcode 206 python

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