Firebase Admin Python SDK v2.17.0

Firebase Cloud Messaging

• A new messaging.send_multicast() API for sending a message to a list of device registration tokens. Thanks ZachOrr for the contribution.
• A new messaging.send_all() API for sending a list of messages as a single batch.

Firebase Auth

• A new auth.DELETE_ATTRIBUTE constant that can be used with the update_user() API to remove certain attributes from user accounts. This is now the preferred way to delete attributes like display_name, photo_url and custom_claims.