Python二叉树高度递归计算函数的空白处应填写以下哪项?
class Node:
def __init__(self, data):
self.data = data
self.left = None
self.right = None
def height(root):
if root is None:
return 0
else:
left_height = height(root.left)
right_height = height(root.right)
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