AttributeError: 'list' object has no attribute 'values'

引用中的错误是由于'list'对象没有'values'属性导致的。根据错误信息中提到的代码`if left.val!=right.val: return False`，我们可以判断出在判断叶子节点的值是否相等时出现了问题。而根据引用中的描述，这个问题通常出现在叶子节点的临界值位置，即当某个节点的左子树或右子树为空时。因此，我们需要在判断节点是否为空之前先判断左右子树是否为空。修改后的代码如下所示：

if left is None or right is None:
    return False
if left.val != right.val:
    return False

这样做可以避免在左右子树为空时访问其值，从而解决了"AttributeError: 'list' object has no attribute 'values'"的问题。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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