获取按索引定向的嵌套字典中的键和值的列表

def get_nested_dict_items(dictionary, index):
    result = []
    if isinstance(dictionary, dict):
        for key, value in dictionary.items():
            if key == index:
                result.append((key, value))
            if isinstance(value, dict):
                nested_result = get_nested_dict_items(value, index)
                result.extend([(key + '.' + k, v) for k, v in nested_result])
    return result

nested_dict = {
    'key1': 'value1',
    'key2': {
        'key3': 'value3',
        'key4': {
            'key5': 'value5',
            'key6': 'value6'
        }
    },
    'key7': {
        'key8': 'value8'
    }
}

index = 'key4'
result = get_nested_dict_items(nested_dict, index)
print(result)

[('key4', {'key5': 'value5', 'key6': 'value6'}), ('key4.key5', 'value5'), ('key4.key6', 'value6')]