如何导航深度未知的嵌套对象？

def navigate_nested_object(obj, target_key):
    if isinstance(obj, dict):
        for key, value in obj.items():
            if key == target_key:
                return value
            elif isinstance(value, (dict, list)):
                result = navigate_nested_object(value, target_key)
                if result is not None:
                    return result
    elif isinstance(obj, list):
        for item in obj:
            if isinstance(item, (dict, list)):
                result = navigate_nested_object(item, target_key)
                if result is not None:
                    return result
    return None