how i set new permission for containers?

azureContainers.py

from azure.storage.blob import BlockBlobService
from azure.storage import AccessPolicy

accountName = "*"
accountKey = "*"


def containersToUnPublic():

    block_blob_service = BlockBlobService(account_name=accountName,
                                          account_key=accountKey)

    containers = block_blob_service.list_containers()
    for c in containers:
        access_policy = AccessPolicy(permission=ContainerPermissions.READ)

        identifiers = {'id': access_policy}
        block_blob_service.set_container_acl(c.name, identifiers)

        block_blob_service.set_container_acl(c.name)
        print("--> ", c.name, ' permession added...')