我有一個(gè)file/s3.py帶有自定義類S3（大寫）的python文件，它有方法get_list_of_objects()。在此方法中，有稱為鏈接的 boto3 方法，self.bucket.objects.filter()如何模擬這些 boto3 方法？project_dir/file/s3.pyimport boto3import botocoreimport pandasclass S3:    def __init__(self, bucket_name="my_bucket_of_stuff"):        self.s3_resource = boto3.resource("s3")        self.bucket = self.s3_resource.Bucket(bucket_name)        self.s3_client = boto3.client("s3")        self._bucket_name = bucket_name    def get_list_of_objects(self, key_prefix):        key_list = []        for object_summary in self.bucket.objects.filter(Prefix=key_prefix):  #mock this bucket.objects.filter            key_list.append(object_summary.key)        return key_list到目前為止我的嘗試 project_dir/tests/test.pyimport unittestimport file.s3from unittest.mock import patchfrom file.s3 import S3class TestS3Class(unittest.TestCase):    """TestCase for storage/s3.py"""    def setUp(self):        """Creates an instance of the live S3 class for testing"""        self.s3_test_client = S3()    @patch('file.s3.S3.bucket')    @patch('file.s3.S3.bucket.objects')    @patch('file.s3.S3.bucket.objects.filter')    def test_get_list_of_objects(self, mock_filter, mock_objects, mock_bucket):        """Asserts retrieved dictionary of S3 objects is processed and returned as type list"""        mock_bucket.return_value = None        mock_objects.return_value = None        mock_filter.return_value = {'key': 'value'}        self.assertIsInstance(self.s3_test_client.get_list_of_objects(key_prefix='key'), list)這會(huì)產(chǎn)生錯(cuò)誤ModuleNotFoundError: No module named 'file.s3.S3'; 'file.s3' is not a package我一定是弄亂了補(bǔ)丁的位置，但我不知道怎么弄。