python - 如何在 Spyder/Anaconda 中使用 Python 从 Azure Blob 下载/上传文件

Question

我是 Azure 新手。我今天创建了一个 Blob 存储。我正在尝试运行一些在网上找到的 Python 代码，以从此 Blob 容器下载文件。这是我正在测试的代码。

# download_blobs.py
# Python program to bulk download blob files from azure storage
# Uses latest python SDK() for Azure blob storage
# Requires python 3.6 or above
import os
from azure.storage.blob import BlobServiceClient, BlobClient
from azure.storage.blob import ContentSettings, ContainerClient
 
# IMPORTANT: Replace connection string with your storage account connection string
# Usually starts with DefaultEndpointsProtocol=https;...
MY_CONNECTION_STRING = "DefaultEndpointsProtocol=https;AccountName=ryanpythonstorage;AccountKey=my_account_key;EndpointSuffix=core.windows.net"

# Replace with blob container
MY_BLOB_CONTAINER = "ryanpythonstorage" #copied from Access Keys
 
# Replace with the local folder where you want files to be downloaded
LOCAL_BLOB_PATH = "C:\\Users\\ryans\\Desktop\\blob\\"
 
class AzureBlobFileDownloader:
  def __init__(self):
    print("Intializing AzureBlobFileDownloader")
 
    # Initialize the connection to Azure storage account
    self.blob_service_client =  BlobServiceClient.from_connection_string(MY_CONNECTION_STRING)
    self.my_container = self.blob_service_client.get_container_client(MY_BLOB_CONTAINER)
 
 
  def save_blob(self,file_name,file_content):
    # Get full path to the file
    download_file_path = os.path.join(LOCAL_BLOB_PATH, file_name)
 
    # for nested blobs, create local path as well!
    os.makedirs(os.path.dirname(download_file_path), exist_ok=True)
 
    with open(download_file_path, "wb") as file:
      file.write(file_content)
 
  def download_all_blobs_in_container(self):
    my_blobs = self.my_container.list_blobs()
    for blob in my_blobs:
      print(blob.name)
      bytes = self.my_container.get_blob_client(blob).download_blob().readall()
      self.save_blob(blob.name, bytes)
 
# Initialize class and upload files
azure_blob_file_downloader = AzureBlobFileDownloader()
azure_blob_file_downloader.download_all_blobs_in_container()

这是我运行代码时看到的结果。

Intializing AzureBlobFileDownloader
Traceback (most recent call last):

  File "C:\Users\ryans\AppData\Local\Temp\ipykernel_14020\3010845424.py", line 37, in <module>
    azure_blob_file_downloader.download_all_blobs_in_container()

  File "C:\Users\ryans\AppData\Local\Temp\ipykernel_14020\3010845424.py", line 30, in download_all_blobs_in_container
    for blob in my_blobs:

  File "C:\Users\ryans\anaconda3\lib\site-packages\azure\core\paging.py", line 129, in __next__
    return next(self._page_iterator)

  File "C:\Users\ryans\anaconda3\lib\site-packages\azure\core\paging.py", line 76, in __next__
    self._response = self._get_next(self.continuation_token)

  File "C:\Users\ryans\anaconda3\lib\site-packages\azure\storage\blob\_list_blobs_helper.py", line 79, in _get_next_cb
    process_storage_error(error)

  File "C:\Users\ryans\anaconda3\lib\site-packages\azure\storage\blob\_shared\response_handlers.py", line 177, in process_storage_error
    exec("raise error from None")   # pylint: disable=exec-used # nosec

  File "<string>", line 1, in <module>

  File "C:\Users\ryans\anaconda3\lib\site-packages\azure\storage\blob\_list_blobs_helper.py", line 72, in _get_next_cb
    return self._command(

  File "C:\Users\ryans\anaconda3\lib\site-packages\azure\storage\blob\_generated\operations\_container_operations.py", line 1479, in list_blob_flat_segment
    map_error(status_code=response.status_code, response=response, error_map=error_map)

  File "C:\Users\ryans\anaconda3\lib\site-packages\azure\core\exceptions.py", line 105, in map_error
    raise error

ResourceNotFoundError: The specified container does not exist.
RequestId:4d2df1c1-a01e-008b-4209-21e493000000
Time:2022-02-13T18:44:14.1140999Z
ErrorCode:ContainerNotFound
Content: <?xml version="1.0" encoding="utf-8"?><Error><Code>ContainerNotFound</Code><Message>The specified container does not exist.
RequestId:4d2df1c1-a01e-008b-4209-21e493000000
Time:2022-02-13T18:44:14.1140999Z</Message></Error>

最终，我希望能够做两件事:

1. 将文件从我的 Blob 下载到本地计算机
2. 将文件从我的本地计算机上传到我的 Blob。

Answer 1

错误消息是找不到容器。可能是:

• 权限问题(连接字符串)
• 容器名称有问题

在 MY_CONNECTION_STRING 和 MY_BLOB_CONTAINER 中，您的帐户名称和容器名称相同。如果其中之一不正确，则会解释该错误。