Change log

This page lists user-visible changes to the Python SDK, newest first; each section covers the changes since the previous release of this component.

1.35

Released 2026-11-06 as sdk-python/v1.35.0. Reference: 1.35.x.

Workers and the Client’s first call now require server-zd 0.1.17 or later (protocol version 4). Upgrade all server processes before upgrading the SDK. Reference.
Worker startup fails when max_concurrent_tasks exceeds matching.maxConcurrentTasksCap (256 by default). Lower the Worker setting or raise the server cap and matching.maxStreams first. Reference.
RetryPolicy.total_duration now starts at the first hand-out and only gates scheduling another retry. Set method timeouts to bound running attempts. API reference.
A Step with no available or supporting Worker waits durably without consuming a retry. Set a Flow timeout to bound that wait. Reference.
A Step attempt interrupted after its hand-out was committed fails with NOT_COMPLETED and consumes a retry. Review retry policies and side effects before upgrading. Reference.

RecoveryErrorInfo.attempt_progress distinguishes a failed Step method that never started from one that may have run. API reference.

Workers open one execution stream per slot; reserved_rpc_tasks selects RPC-only slots. By default, a Worker with at least two slots reserves one for RPCs. Reference.
stop drains running handlers and returns tasks that did not start without consuming a retry. Reference.

idle_streams_per_queue is accepted but ignored, and pull_reserved_rpc_declines always reports zero. Use execution-slot capacity and queue metrics instead. Reference.

Released 2026-11-01 as sdk-python/v1.32.0. Reference: 1.32.x.

Generated protocol bindings include AdminService, with DescribeActiveNode and StepDownActiveNode for inspecting and stepping down the active server process. Release notes.

Released 2026-10-31 as sdk-python/v1.30.0. Reference: 1.30.x.

Generated protocol bindings add ERROR_SUB_STATUS_ATTRIBUTE_INDEX_CAPACITY_EXCEEDED and ERROR_SUB_STATUS_INDEXED_KEYWORD_TOO_LONG for Attribute index admission errors. Release notes.

Released 2026-10-31 as sdk-python/v1.29.0. Reference: 1.29.x.

Generated history responses expose the pruned event range and first retained event ID. Step event contexts also carry related event IDs and the WaitFor completion time. Release notes.
Client.get_attributes and AsyncClient.get_attributes read committed Attributes and AttributeMap instances in one request without a Worker. AttributeMap.instance selects an instance, and AttributeValues provides typed result lookup. API reference.

Older releases: GitHub releases.