在Python中构建具有"parent“支持的树

class TreeNode:
    def __init__(self, value):
        self.value = value
        self.parent = None
        self.children = []

    def add_child(self, child):
        child.parent = self
        self.children.append(child)

root = TreeNode("Root")

child1 = TreeNode("Child 1")
root.add_child(child1)

child2 = TreeNode("Child 2")
root.add_child(child2)

grandchild = TreeNode("Grandchild")
child1.add_child(grandchild)

def traverse_tree(node):
    print(node.value)
    for child in node.children:
        traverse_tree(child)

traverse_tree(root)