如何“解包”一个循环嵌套的对象属性？

def unpack_nested_object(obj):
    result = {}

    def unpack(obj, prefix=''):
        if isinstance(obj, dict):
            for key, value in obj.items():
                new_prefix = prefix + key + '.'
                unpack(value, new_prefix)
        else:
            result[prefix[:-1]] = obj

    unpack(obj)
    return result

obj = {
    'a': 1,
    'b': {
        'c': 2,
        'd': {
            'e': 3
        }
    }
}

{
    'a': 1,
    'b.c': 2,
    'b.d.e': 3
}