如何检查一个子节点在图中是否有多个父节点？并打印出父级和子级

def check_multiple_parents(edges):
    parents = {}
    for parent, child in edges:
        if child not in parents:
            parents[child] = [parent]
        else:
            parents[child].append(parent)
    
    for child, parent_list in parents.items():
        if len(parent_list) > 1:
            print("子节点:", child)
            print("父节点:", parent_list)

# 示例输入
edges = [("A", "B"), ("A", "C"), ("B", "D"), ("C", "D"), ("E", "D"), ("F", "E")]

# 调用函数进行检查并打印结果
check_multiple_parents(edges)

子节点: D
父节点: ['B', 'C']