[学习记录]Azure Blob Storage :Upload blobs to a container

import os,uuid
from azure.identity import DefaultAzureCredential
from azure.storage.blob import BlobServiceClient,BlobClient,ContainerClient
#DefaultAzureCredential:在代码中实现与Azure服务的无密码链接
try:
    #connect your app code to Azure using DefaultAzureCredential
    print("Azure Blob Storage Python quickstart sample")
    account_url="https://xxxxx.blob.core.windows.net"
    default_credential = DefaultAzureCredential()
    #create a object of BlobServiceClient
    #the BlobServiceClient class allows you to manipuate Azure Storage resources and blob containers
    blob_service_client=BlobServiceClient(account_url,credential=default_credential)
    #Create a container
    container_name = "xxxxxxxx"
    container_client = blob_service_client.create_container(container_name)##failedEnvironmentCredential: EnvironmentCredential authentication unavailable. Environment variables are not fully configured.
    #
    #create a local directory to hold blod date
    local_path = './data'
    os.mkdir(local_path)
    #create a file in the local data directory to upload and download
    local_file_name = str(uuid.uuid4()) + ".txt"
    upload_file_path=os.path.join(local_path,local_file_name)
    #write text to the file
    file=open(file=upload_file_path,mode='w')
    file.write("Hello World!")
    file.close()
    #create a blob client using local file name as the name for the blob
    blob_client=blob_service_client.get_blob_client(container=container_name,blob=local_file_name)
    print("\nUploading to Azure Storage as blob:\n\t" + local_file_name)
    #upload the created file
    with open(file=upload_file_path,mode="rb") as data:
        blob_client.upload_blob(data)
    #list the blobs in the container
    blob_list = container_client.list_blobs()
    for blob in blob_list:
        print("\t" + blob.name)
    #clean up
    print("\nPress the Enter key to begin clean up.")
    input()
    print("Deleting the Blob container...")
    container_client.delete_container()
    #
    print("Deleting the local sources...")
    os.remove(upload_file_path)
    os.rmdir(local_path)
except Exception as ex:
    print("Exception:")
    print(ex)

error:

Azure Blob Storage Python quickstart sample
DefaultAzureCredential failed to retrieve a token from the included credentials.
Attempted credentials:
        EnvironmentCredential: EnvironmentCredential authentication unavailable. Environment variables are not fully configured.
Visit https://aka.ms/azsdk/python/identity/environmentcredential/troubleshoot to troubleshoot this issue.
        ManagedIdentityCredential: ManagedIdentityCredential authentication unavailable, no response from the IMDS endpoint.
        SharedTokenCacheCredential: SharedTokenCacheCredential authentication unavailable. No accounts were found in the cache.
        AzureCliCredential: Azure CLI not found on path
        AzurePowerShellCredential: Failed to invoke PowerShell
        AzureDeveloperCliCredential: Azure Developer CLI could not be found. Please visit https://aka.ms/azure-dev for installation instructions and then,once installed, authenticate to your Azure account using 'azd auth login'.
To mitigate this issue, please refer to the troubleshooting guidelines here at https://aka.ms/azsdk/python/identity/defaultazurecredential/troubleshoot.

解决：
1.在Azure portal 的Access Control (IAM)上赋予用户Storage Blob Data Contributor权限
2.在local安装Azure CLI后，在VSCODE中运行 az login 命令登录到Azure。
3.执行代码

其他：
①application 链接到Azure Blob Storage
可以通过Azure Identity client library的DefaultAzureCredential class来实现无密码链接。

②在本地开发时，为了确保用户能够读写blob data，需要赋予用户Storage Blob Data Contributor的权限。

参考资料：Quickstart: Azure Blob Storage client library for Python

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