如何从递归字典检查返回差值

def recursive_dict_diff(original_dict, target_dict):
    diff_dict = {}
    for key in original_dict:
        if key not in target_dict:
            diff_dict[key] = original_dict[key]
        else:
            if isinstance(original_dict[key], dict) and isinstance(target_dict[key], dict):
                nested_diff = recursive_dict_diff(original_dict[key], target_dict[key])
                if nested_diff:
                    diff_dict[key] = nested_diff
            elif original_dict[key] != target_dict[key]:
                diff_dict[key] = original_dict[key]
    return diff_dict

# 示例用法
original = {
    'name': 'John',
    'age': 30,
    'address': {
        'street': '123 Main St',
        'city': 'New York'
    }
}

target = {
    'name': 'John',
    'age': 35,
    'address': {
        'street': '123 Main St',
        'city': 'San Francisco'
    }
}

diff = recursive_dict_diff(original, target)
print(diff)

{
    'age': 30,
    'address': {
        'city': 'New York'
    }
}