The Azure SDK team is pleased to make available the October 2019 client library preview release. This represents the first release of the ground-up rewrite of the client libraries to ensure consistency, idiomatic design, and excellent developer experience and productivity. This preview release includes new client libraries for Azure Cosmos, Identity, Key Vault (certificates, keys and secrets), Event Hubs, and Storage (blob, files and queues).

Installation Instructions

To install the latest preview version of the packages, copy and paste the following commands into a terminal:

pip install --pre azure-cosmos
pip install --pre azure-eventhub
pip install --pre azure-eventhub-checkpointstoreblob-aio
pip install --pre azure-keyvault-certificates
pip install --pre azure-keyvault-keys
pip install --pre azure-keyvault-secrets
pip install --pre azure-storage-blob
pip install --pre azure-storage-file
pip install --pre azure-storage-queue
pip install --pre azure-appconfiguration
pip install --pre azure-identity


If you have a bug or feature request for one of the libraries, please post an issue to GitHub.


Detailed change logs are linked to in the Quick Links below. Here are some critical call outs.


  • Added support for a timeout keyword argument to all operations to specify an absolute timeout in seconds within which the operation must be completed. If the timeout value is exceeded, a azure.cosmos.errors.CosmosClientTimeoutError will be raised.
  • Added a new ConnectionRetryPolicy to manage retry behaviour during HTTP connection errors, along with constructor and per-operation keyword arguments to configure retry behavior.

Event Hubs

  • Added support for tracing (issue #7153).
  • Added new boolean type parameter track_last_enqueued_event_properties in method EventHubClient.create_consumer().
  • Added new property last_enqueued_event_properties of EventHubConsumer which contains sequence_number, offset, enqueued_time and retrieval_time information.
  • Removed support for IoT Hub direct connection. EventHubs compatible connection string of an IoT Hub can be used to create EventHubClient and read properties or events from an IoT Hub.
  • Removed support for sending EventData to IoT Hub.
  • Removed parameter exception in method close() of EventHubConsumer and EventHubProcuer.

Key Vault

  • Restructured the Certificate, Key, and Secret models. For more specific details, see the respective certificate, key, and secret changelogs.
  • Both async and sync versions of create_certificate return pollers now that poll on the certificate’s successful creation


  • Added batching support in blobs.
  • Added support to set rehydrate priority in blobs.
  • Breaking changes in PermissionModels for blobs, queues and files.
  • Modified several methods in blobs to use more keyworrd-only arguments.
  • Other breaking changes in blobs, queues and files.


  • AuthorizationCodeCredential authenticates with a previously obtained authorization code. See Azure Active Directory’s authorization code documentation for more information about this authentication flow.
  • Multi-cloud support: client credentials accept the authority of an Azure Active Directory authentication endpoint as an authority keyword argument. Known authorities are defined in azure.identity.KnownAuthorities. The default authority is for Azure Public Cloud, (KnownAuthorities.AZURE_PUBLIC_CLOUD).

See Nov Release