list virtual folders in azure blob storage via python API

Question

I was reading this tutorial but I cannot find a way to list all the (virtual) folder under a container without getting all the files. I have 26K files in 500 (virtual) folders. I just want to get the list of folder without having to wait few minutes to get the output of list_blobs containing the entire file list. Is there a way to do that? or at least tell list_blobs to not go deeper than n levels below a container?

Answer 1

You can try something like the following:

from azure.storage import BlobService

blob_service = BlobService(account_name='account-name', account_key='account-key')

bloblistingresult = blob_service.list_blobs(container_name='container-name', delimiter='/') 
for i in bloblistingresult.prefixes:
        print(i.name) #this will print the names of the virtual folders

SDK Source Code Reference: BlobService.list_blobs()
SKD Source Code Reference: BlobService.list_blobs().prefixes

Answer 2

Perhaps it's not too late for 2someone. list_blobs doesn't accept delimiter argument. Instead, use walk_blobs ( doc ) to get a generator with the files. Using delimiter="/" you will get the next sublevel of files/folders:

For example:

blob_service_client = BlobServiceClient.from_connection_string(file_connect_str)
container_client = blob_service_client.get_container_client(container_name)
for file in container_client.walk_blobs('my_folder/', delimiter='/'):
    print(file.name)

will return:

"my_folder/sub_folder_1/"
"my_folder/sub_folder_2/"

Answer 3

@ Gaurav Mantri pointed out the correct way to get a list of BlobPrefix elements, and we can leverage this to create a function to require your requirement:

For example I have 4 levels in directory:

import azure
from azure.storage.blob import BlobService
blob_service = BlobService(account_name='<account_name>', account_key='<account_key>')
def getfolders(depth=1):
    result = []
    searched = []
    delimiter = '/'
    print depth
    blob_list = blob_service.list_blobs('container-name',delimiter='/')
    result.extend(str(l.name) for l in blob_list.prefixes)
    #for l in blob_list.prefixes:
    #    result.extend(str(l.name))
    depth -= 1 
    while (depth>0):
        print 'result: \n'
        print ','.join(str(p) for p in result)
        print 'searched: \n'
        print ','.join(p for p in searched)
        for p in [item for item in result if item not in searched]:
            print p +' in '+ str(depth)
            searched.append(p)
            blob_list = blob_service.list_blobs('vsdeploy',prefix=p,delimiter='/')
            result.extend(str(l.name) for l in blob_list.prefixes)
        depth -= 1 
    return result

blob_list = getfolders(4)
print ','.join(str(p) for p in blob_list)