如何使用递归在python中创建字典数据的完整依赖项集

def create_dependency_set(dictionary, key):
    dependency_set = {}
    # 根据键的值获取依赖项列表
    dependencies = dictionary.get(key, [])

    # 遍历依赖项列表
    for dependency in dependencies:
        # 递归调用函数，创建依赖项的依赖项集
        sub_dependency_set = create_dependency_set(dictionary, dependency)
        # 将子依赖项集合并到当前依赖项集中
        dependency_set.update(sub_dependency_set)
    
    # 将当前依赖项添加到依赖项集中
    dependency_set[key] = dependencies
    
    return dependency_set

dependencies_dict = {
    'A': ['B', 'C'],
    'B': ['D'],
    'C': ['E', 'F'],
    'E': ['G'],
    'F': ['H']
}

dependency_set = create_dependency_set(dependencies_dict, 'A')

{
    'A': ['B', 'C'],
    'B': ['D'],
    'C': ['E', 'F'],
    'D': [],
    'E': ['G'],
    'F': ['H'],
    'G': [],
    'H': []
}