quote_from_bytes() expected bytes error when data is in bytes format when uploading to blob storage in Python3

Question

Can someone tell me what I am doing wrong with trying to upload an image to blob storage? Below is my code.

print(type(img['image'])) #Output is <class 'bytes'>

connection_string = get_blob_connection_string()
blob_service_client = BlobServiceClient.from_connection_string(connection_string)
blob_client = blob_service_client.get_blob_client(container="images", blob=img['id'])

exists = blob_client.exists()
if (exists == False):
    result = blob_client.upload_blob(img['image'], blob_type="blockblob")
    print(result)

When inserting the blob, it throws the error

quote_from_bytes() expected bytes

This error makes no sense, I gave it bytes. What am I missing?

Answer 1

After reproducing from my end, I have received the same issue. You are receiving this error because of incompatible type of the file (i.e., file format).

After changing the below line to the correct format I could able to achieve your requirement.

blob_client = blob_service_client.get_blob_client(container="images", blob=img['id'])

Below is the correct format

blob_client=blob_service_client.get_blob_client(container='container', blob='<LOCAL FILE PATH>');

Below is the complete code that worked for me

from  azure.storage.blob  import  BlobServiceClient
from  PIL  import  Image

connection_string = "<CONNECTION STRING>"
blob_service_client = BlobServiceClient.from_connection_string(connection_string)
blob_client=blob_service_client.get_blob_client(container='container', blob='<LOCALPATH>');

with  open(file='<PATH IN YOUR STORAGE ACCOUNT WITH FILE NAME>', mode="rb") as  data:

blob_client.upload_blob(data)

RESULTS:

Answer 2

Another cause for this error is to provide BlobServiceClient.get_blob_client with a Path object as blob name (blob parameter). In this case, you must do the cast to string yourself:

file_path = Path("my_path")
blob_client = blob_service_client.get_blob_client(container="my_container", blob=str(file_path))

The same error occurs for ContainerClient.get_blob_client, ContainerClient.upload_blob and probably other related methods.