Read a blob directly without downloading it(python azure sdk

Question

Hello,

If I want to read/revise a blob in a container, do I need to download to vm to read/revise it? Or can I just read/revise it through any other methods like blob service etc?

As I saw the legacy SDK was able to do it like get_blob_to_stream in azure.storage.blob.baseblobservice. Is there new SDK that can achieve the similar results?

Thanks!

Answer 1

@Nate Lo Yih-Shiou You have that option ! If you want to read a blob into a stream. There’s an equivalent method in the new version.
Please refer to this article: https://azuresdkdocs.blob.core.windows.net/$web/python/azure-storage-blob/12.3.2/azure.storage.blob.html#azure.storage.blob.BlobClient.download_blob

with open(DEST_FILE, "wb") as my_blob:  
    download_stream = blob_client.download_blob()  
    download_stream.readinto(my_blob)  

However, if you want to modify only part of a blob, let's say a block of a block blob. You don't have to download the whole blob then you should be able to update only a block.

Hope this helps!
Kindly let us know if the above helps or you need further assistance on this issue.

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Answer 2

what is DEST_FILE ? file path that we want to download?