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```
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class Solution(object):
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- def isSymmetric(self, root):
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- """
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- :type root: TreeNode
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- :rtype: bool
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- """
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- #如果为空或只有root节点
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- if not root or not (root.left or root.right):
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- return True
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- # 用队列保存节点
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- queue = [root.left,root.right]
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- while queue:
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- # 从队列中取出两个节点,再比较这两个节点
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- left = queue.pop(0)
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- right = queue.pop(0)
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- # 如果两个节点都为空就继续循环,两者有一个为空就返回false
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- if not (left or right):
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- continue
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- if not (left and right):
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- return False
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- if left.val!=right.val:
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- return False
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- # 将左节点的左孩子, 右节点的右孩子放入队列
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- queue.append(left.left)
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- queue.append(right.right)
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- # 将左节点的右孩子,右节点的左孩子放入队列
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- queue.append(left.right)
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- queue.append(right.left)
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- return True
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- ```
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+ def isSymmetric(self, root):
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+ """
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+ :type root: TreeNode
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+ :rtype: bool
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+ """
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+ #如果为空或只有root节点
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+ if not root or not (root.left or root.right):
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+ return True
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+ # 用队列保存节点
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+ queue = [root.left,root.right]
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+ while queue:
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+ # 从队列中取出两个节点,再比较这两个节点
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+ left = queue.pop(0)
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+ right = queue.pop(0)
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+ # 如果两个节点都为空就继续循环,两者有一个为空就返回false
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+ if not (left or right):
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+ continue
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+ if not (left and right):
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+ return False
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+ if left.val!=right.val:
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+ return False
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+ # 将左节点的左孩子, 右节点的右孩子放入队列
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+ queue.append(left.left)
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+ queue.append(right.right)
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+ # 将左节点的右孩子,右节点的左孩子放入队列
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+ queue.append(left.right)
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+ queue.append(right.left)
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+ return True
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+ ```
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