如何在树状图中打印特定数量的项目

class TreeNode:
    def __init__(self, value):
        self.value = value
        self.children = []

def print_projects(root, count):
    if root is None:
        return
    
    if count == 0:
        return
    
    if count == 1:
        print(root.value)
    
    count -= 1
    for child in root.children:
        print_projects(child, count)
    
    count += 1

# 创建一个示例树
root = TreeNode("A")
root.children.append(TreeNode("B"))
root.children.append(TreeNode("C"))
root.children[0].children.append(TreeNode("D"))
root.children[0].children.append(TreeNode("E"))
root.children[1].children.append(TreeNode("F"))

# 打印两个项目
print_projects(root, 2)

A
B