python二叉树层序遍历

二叉树的层序遍历可以通过不同的方法实现。其中一种方法是使用队列的思想。每次循环遍历一层的节点，将其子节点加入队列，并将遍历的值加入结果中。以下是一个用Python实现的例子：

# Definition for a binary tree node.
# class TreeNode(object):
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right

class Solution(object):
    def levelOrder(self, root):
        """
        :type root: TreeNode
        :rtype: List[List[int]]
        """
<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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