How to replay a Workflow Execution in Python

To replay a Workflow Execution, use the replay_workflow() method and pass a Workflow History as an argument.

In the following example, history_json_str references the Workflow History as a JSON string.

async def run_replayer(history_json_str: str):
    replayer = Replayer(workflows=[YourWorkflow])
    await replayer.replay_workflow(history_json_str)

If the Workflow History is non-deterministic, run_replayer() raises an error.

note

If the Workflow History is exported by Temporal Web UI or through tctl, you can pass the JSON file history object as a JSON string or as a Python dictionary through the json.load() function, which takes a file object and returns the JSON object.