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Title: Workflow message passing - Python SDK | Temporal Platform Documentation

Open Graph Title: Workflow message passing - Python SDK | Temporal Platform Documentation

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Continue-As-Newhttps://docs.temporal.io/develop/python/workflows/continue-as-new
Cancellationhttps://docs.temporal.io/develop/python/workflows/cancellation
Timeoutshttps://docs.temporal.io/develop/python/workflows/timeouts
Messageshttps://docs.temporal.io/develop/python/workflows/message-passing
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https://docs.temporal.io/
Develophttps://docs.temporal.io/develop/
Python SDKhttps://docs.temporal.io/develop/python/
Workflowshttps://docs.temporal.io/develop/python/workflows/
View Markdownhttps://docs.temporal.io/develop/python/workflows/message-passing.md
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Workflow message passinghttps://docs.temporal.io/encyclopedia/workflow-message-passing
​https://docs.temporal.io/develop/python/workflows/message-passing#writing-message-handlers
samplehttps://github.com/temporalio/samples-python/tree/main/message_passing/introduction
@workflow.queryhttps://python.temporal.io/temporalio.workflow.html#query
@workflow.signalhttps://python.temporal.io/temporalio.workflow.html#signal
@workflow.updatehttps://python.temporal.io/temporalio.workflow.html#update
serializablehttps://docs.temporal.io/dataconversion
data classeshttps://docs.python.org/3/library/dataclasses.html
​https://docs.temporal.io/develop/python/workflows/message-passing#queries
Queryhttps://docs.temporal.io/sending-messages#sending-queries
@workflow.queryhttps://python.temporal.io/temporalio.workflow.html#query
​https://docs.temporal.io/develop/python/workflows/message-passing#signals
Signalhttps://docs.temporal.io/sending-messages#sending-signals
@workflow.signalhttps://python.temporal.io/temporalio.workflow.html#signal
asyncio.sleephttps://docs.python.org/3/library/asyncio-task.html#asyncio.sleep
workflow.wait_conditionhttps://python.temporal.io/temporalio.workflow.html#wait_condition
Async handlershttps://docs.temporal.io/develop/python/workflows/message-passing#async-handlers
Workflow message passinghttps://docs.temporal.io/encyclopedia/workflow-message-passing
​https://docs.temporal.io/develop/python/workflows/message-passing#updates
Updatehttps://docs.temporal.io/sending-messages#sending-updates
workflow.updatehttps://python.temporal.io/temporalio.workflow.html#update
workflow.current_update_infohttps://python.temporal.io/temporalio.workflow.html#current_update_info
Ensuring your messages are processed exactly oncehttps://docs.temporal.io/handling-messages#exactly-once-message-processing
asyncio.sleephttps://docs.python.org/3/library/asyncio-task.html#asyncio.sleep
workflow.wait_conditionhttps://python.temporal.io/temporalio.workflow.html#wait_condition
Async handlershttps://docs.temporal.io/develop/python/workflows/message-passing#async-handlers
Workflow message passinghttps://docs.temporal.io/encyclopedia/workflow-message-passing
​https://docs.temporal.io/develop/python/workflows/message-passing#send-messages
WorkflowHandlehttps://python.temporal.io/temporalio.client.WorkflowHandle.html
start_workflowhttps://python.temporal.io/temporalio.client.Client.html#start_workflow
get_workflow_handle_forhttps://python.temporal.io/temporalio.client.Client.html#get_workflow_handle_for
​https://docs.temporal.io/develop/python/workflows/message-passing#send-query
WorkflowHandle.queryhttps://python.temporal.io/temporalio.client.WorkflowHandle.html#query
​https://docs.temporal.io/develop/python/workflows/message-passing#send-signal
​https://docs.temporal.io/develop/python/workflows/message-passing#send-signal-from-client
WorkflowHandle.signalhttps://python.temporal.io/temporalio.client.WorkflowHandle.html#signal
WorkflowExecutionSignaledhttps://docs.temporal.io/references/events#workflowexecutionsignaled
​https://docs.temporal.io/develop/python/workflows/message-passing#send-signal-from-workflow
get_external_workflow_handle_forhttps://python.temporal.io/temporalio.workflow.html#get_external_workflow_handle_for
See full samplehttps://github.com/temporalio/documentation/blob/main/sample-apps/python/signal_your_workflow/signal_external_wf_dacx.py
SignalExternalWorkflowExecutionInitiatedhttps://docs.temporal.io/references/events#signalexternalworkflowexecutioninitiated
WorkflowExecutionSignaledhttps://docs.temporal.io/references/events#workflowexecutionsignaled
​https://docs.temporal.io/develop/python/workflows/message-passing#signal-with-start
start_workflowhttps://python.temporal.io/temporalio.client.Client.html#start_workflow
See full samplehttps://github.com/temporalio/documentation/blob/main/sample-apps/python/signal_your_workflow/signal_with_start_dacx.py
​https://docs.temporal.io/develop/python/workflows/message-passing#send-update-from-client
execute_updatehttps://python.temporal.io/temporalio.client.WorkflowHandle.html#execute_update
start_updatehttps://python.temporal.io/temporalio.client.WorkflowHandle.html#start_update
UpdateHandlehttps://python.temporal.io/temporalio.client.WorkflowUpdateHandle.html
start_updatehttps://python.temporal.io/temporalio.client.WorkflowHandle.html#start_update
get_update_handle_forhttps://python.temporal.io/temporalio.client.WorkflowHandle.html#get_update_handle_for
​https://docs.temporal.io/develop/python/workflows/message-passing#update-with-start
Temporal Server version 1.28https://github.com/temporalio/temporal/releases/tag/v1.28.0
Update-with-Starthttps://docs.temporal.io/sending-messages#update-with-start
send an Updatehttps://docs.temporal.io/develop/python/workflows/message-passing#send-update-from-client
execute_update_with_start_workflowhttps://python.temporal.io/temporalio.client.Client.html#start_update_with_start_workflow
start_update_with_start_workflowhttps://python.temporal.io/temporalio.client.Client.html#start_update_with_start_workflow
WorkflowUpdateHandlehttps://python.temporal.io/temporalio.client.WorkflowUpdateHandle.html
WithStartWorkflowOperationhttps://python.temporal.io/temporalio.client.WithStartWorkflowOperation.html
WorkflowIdConflictPolicyhttps://docs.temporal.io/workflow-execution/workflowid-runid#workflow-id-conflict-policy
lazy_initializationhttps://github.com/temporalio/samples-python/blob/main/message_passing/update_with_start/lazy_initialization/starter.py
Client.start_workflowhttps://python.temporal.io/temporalio.client.Client.html#start_workflow
WorkflowHandle.queryhttps://python.temporal.io/temporalio.client.WorkflowHandle.html#query
WorkflowHandle.signalhttps://python.temporal.io/temporalio.client.WorkflowHandle.html#signal
WorkflowHandle.execute_updatehttps://python.temporal.io/temporalio.client.WorkflowHandle.html#execute_update
WorkflowHandle.start_updatehttps://python.temporal.io/temporalio.client.WorkflowHandle.html#start_update
get_workflow_handlehttps://python.temporal.io/temporalio.client.Client.html#get_workflow_handle
get_external_workflow_handlehttps://python.temporal.io/temporalio.workflow.html#get_external_workflow_handle
​https://docs.temporal.io/develop/python/workflows/message-passing#message-handler-patterns
Inject work into the main Workflowhttps://docs.temporal.io/handling-messages#injecting-work-into-main-workflow
Ensuring your messages are processed exactly oncehttps://docs.temporal.io/handling-messages#exactly-once-message-processing
this samplehttps://github.com/temporalio/samples-python/blob/message-passing/message_passing/safe_message_handlers/README.md
​https://docs.temporal.io/develop/python/workflows/message-passing#async-handlers
asyncio.sleephttps://docs.python.org/3/library/asyncio-task.html#asyncio.sleep
workflow.wait_conditionhttps://python.temporal.io/temporalio.workflow.html#wait_condition
Workflow message passinghttps://docs.temporal.io/encyclopedia/workflow-message-passing
Safe message handlershttps://github.com/temporalio/samples-python/tree/main/message_passing/safe_message_handlers
Controlling handler concurrencyhttps://docs.temporal.io/develop/python/workflows/message-passing#control-handler-concurrency
Waiting for message handlers to finishhttps://docs.temporal.io/develop/python/workflows/message-passing#wait-for-message-handlers
​https://docs.temporal.io/develop/python/workflows/message-passing#add-wait-conditions-to-block
workflow.wait_conditionhttps://python.temporal.io/temporalio.workflow.html#wait_condition
​https://docs.temporal.io/develop/python/workflows/message-passing#wait-for-a-signal-or-update-to-arrive
​https://docs.temporal.io/develop/python/workflows/message-passing#wait-in-message-handler
​https://docs.temporal.io/develop/python/workflows/message-passing#wait-for-message-handlers
workflow.wait_conditionhttps://python.temporal.io/temporalio.workflow.html#wait_condition
all_handlers_finishedhttps://python.temporal.io/temporalio.workflow.html#all_handlers_finished
@workflow.signalhttps://python.temporal.io/temporalio.workflow.html#signal
workflow.updatehttps://python.temporal.io/temporalio.workflow.html#update
Finishing handlers before the Workflow completeshttps://docs.temporal.io/handling-messages#finishing-message-handlers
​https://docs.temporal.io/develop/python/workflows/message-passing#use-workflowinit-to-operate-on-workflow-input-before-any-handler-executes
Workflow parametershttps://docs.temporal.io/develop/python/workflows/basics#workflow-parameters
Client senthttps://docs.temporal.io/develop/python/client/temporal-client#start-workflow-execution
Initializing the Workflow firsthttps://docs.temporal.io/handling-messages#workflow-initializers
​https://docs.temporal.io/develop/python/workflows/message-passing#control-handler-concurrency
concurrent message-passinghttps://docs.temporal.io/handling-messages#message-handler-concurrency
​https://docs.temporal.io/develop/python/workflows/message-passing#message-handler-troubleshooting
temporalio.service.RPCErrorhttps://python.temporal.io/temporalio.service.RPCError.html
RPCStatusCodehttps://python.temporal.io/temporalio.service.RPCStatusCode.html
Client.connecthttps://python.temporal.io/temporalio.client.Client.html#connect
temporalio.service.RPCErrorhttps://python.temporal.io/temporalio.service.RPCError.html
RPCStatusCodehttps://python.temporal.io/temporalio.service.RPCStatusCode.html
Exceptions in message handlershttps://docs.temporal.io/handling-messages#exceptions
​https://docs.temporal.io/develop/python/workflows/message-passing#signal-problems
​https://docs.temporal.io/develop/python/workflows/message-passing#update-problems
asyncio.timeouthttps://docs.python.org/3/library/asyncio-task.html#timeouts
temporalio.client.WorkflowUpdateRPCTimeoutOrCancelledErrorhttps://python.temporal.io/temporalio.client.WorkflowUpdateRPCTimeoutOrCancelledError.html
temporalio.client.WorkflowUpdateFailedErrorhttps://python.temporal.io/temporalio.client.WorkflowUpdateFailedError.html
Workflow failureshttps://docs.temporal.io/references/failures#errors-in-workflows
ApplicationErrorhttps://docs.temporal.io/references/failures#application-failure
workflow_failure_exception_typeshttps://python.temporal.io/temporalio.worker.Worker.html
Workflow Task Failurehttps://docs.temporal.io/references/failures#errors-in-workflows
temporalio.service.RPCErrorhttps://python.temporal.io/temporalio.service.RPCError.html
UpdateHandlehttps://python.temporal.io/temporalio.client.WorkflowUpdateHandle.html
temporalio.service.RPCErrorhttps://python.temporal.io/temporalio.service.RPCError.html
RPCStatusCodehttps://python.temporal.io/temporalio.service.RPCStatusCode.html
wait for handlers to be finishedhttps://docs.temporal.io/handling-messages#finishing-message-handlers
​https://docs.temporal.io/develop/python/workflows/message-passing#query-problems
temporalio.service.RPCErrorhttps://python.temporal.io/temporalio.service.RPCError.html
RPCStatusCodehttps://python.temporal.io/temporalio.service.RPCStatusCode.html
temporalio.client.WorkflowQueryFailedErrorhttps://python.temporal.io/temporalio.client.WorkflowQueryFailedError.html
​https://docs.temporal.io/develop/python/workflows/message-passing#dynamic-handler
​https://docs.temporal.io/develop/python/workflows/message-passing#set-a-dynamic-signal
payload_converterhttps://python.temporal.io/temporalio.workflow.html#payload_converter
​https://docs.temporal.io/develop/python/workflows/message-passing#set-a-dynamic-workflow
Workerhttps://python.temporal.io/temporalio.worker.html
payload_converterhttps://python.temporal.io/temporalio.workflow.html#payload_converter
See full samplehttps://github.com/temporalio/documentation/blob/main/sample-apps/python/dynamic_handlers/your_dynamic_workflow_dacx.py
​https://docs.temporal.io/develop/python/workflows/message-passing#set-a-dynamic-activity
Workerhttps://python.temporal.io/temporalio.worker.html
payload_converterhttps://python.temporal.io/temporalio.activity.html#payload_converter
See full samplehttps://github.com/temporalio/documentation/blob/main/sample-apps/python/dynamic_handlers/your_dynamic_activity_dacx.py
Workflowshttps://docs.temporal.io/tags/workflows
Messageshttps://docs.temporal.io/tags/messages
Signalshttps://docs.temporal.io/tags/signals
Querieshttps://docs.temporal.io/tags/queries
Updateshttps://docs.temporal.io/tags/updates
Python SDKhttps://docs.temporal.io/tags/python-sdk
Temporal SDKshttps://docs.temporal.io/tags/temporal-sd-ks
documentationhttps://github.com/temporalio/documentation
PreviousTimeoutshttps://docs.temporal.io/develop/python/workflows/timeouts
NextScheduleshttps://docs.temporal.io/develop/python/workflows/schedules
Write message handlershttps://docs.temporal.io/develop/python/workflows/message-passing#writing-message-handlers
Query handlershttps://docs.temporal.io/develop/python/workflows/message-passing#queries
Signal handlershttps://docs.temporal.io/develop/python/workflows/message-passing#signals
Update handlers and validatorshttps://docs.temporal.io/develop/python/workflows/message-passing#updates
Send messageshttps://docs.temporal.io/develop/python/workflows/message-passing#send-messages
Send a Queryhttps://docs.temporal.io/develop/python/workflows/message-passing#send-query
Send a Signalhttps://docs.temporal.io/develop/python/workflows/message-passing#send-signal
Send an Updatehttps://docs.temporal.io/develop/python/workflows/message-passing#send-update-from-client
Message handler patternshttps://docs.temporal.io/develop/python/workflows/message-passing#message-handler-patterns
Use async handlershttps://docs.temporal.io/develop/python/workflows/message-passing#async-handlers
Add wait conditions to blockhttps://docs.temporal.io/develop/python/workflows/message-passing#add-wait-conditions-to-block
Use @workflow.init to operate on Workflow input before any handler executeshttps://docs.temporal.io/develop/python/workflows/message-passing#use-workflowinit-to-operate-on-workflow-input-before-any-handler-executes
Use asyncio.Lock to prevent concurrent handler executionhttps://docs.temporal.io/develop/python/workflows/message-passing#control-handler-concurrency
Message handler troubleshootinghttps://docs.temporal.io/develop/python/workflows/message-passing#message-handler-troubleshooting
Problems when sending a Signalhttps://docs.temporal.io/develop/python/workflows/message-passing#signal-problems
Problems when sending an Updatehttps://docs.temporal.io/develop/python/workflows/message-passing#update-problems
Problems when sending a Queryhttps://docs.temporal.io/develop/python/workflows/message-passing#query-problems
Dynamic componentshttps://docs.temporal.io/develop/python/workflows/message-passing#dynamic-handler
Set a dynamic Signal, Query, or Update handlerhttps://docs.temporal.io/develop/python/workflows/message-passing#set-a-dynamic-signal
Set a dynamic Workflowhttps://docs.temporal.io/develop/python/workflows/message-passing#set-a-dynamic-workflow
Set a dynamic Activityhttps://docs.temporal.io/develop/python/workflows/message-passing#set-a-dynamic-activity
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