[Python] Fix: Empty Output Serialization#2902
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mrkaye97
commented
Feb 1, 2026
| if resp.status_code == 200: | ||
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| time.sleep(1) |
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Pull request overview
This pull request fixes a bug in the Python SDK where tasks returning nothing would send an empty string ("") instead of None, causing failed to unmarshal json errors on the engine side.
Changes:
- Modified
serialize_outputmethod to returnNoneinstead of empty strings for tasks with no output - Updated type annotations across multiple files to reflect that payloads can be
None - Bumped SDK version from 1.22.13 to 1.22.14
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
| sdks/python/pyproject.toml | Version bump from 1.22.13 to 1.22.14 |
| sdks/python/CHANGELOG.md | Added changelog entry for the new version |
| sdks/python/hatchet_sdk/worker/runner/runner.py | Changed serialize_output to return None instead of empty string; updated type annotations |
| sdks/python/hatchet_sdk/clients/dispatcher/dispatcher.py | Updated type annotations for payload parameters to accept None |
| sdks/python/hatchet_sdk/worker/action_listener_process.py | Updated type annotations for payload field to accept None |
| sdks/python/tests/worker_fixture.py | Added sleep delay after successful health check |
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abelanger5
approved these changes
Feb 1, 2026
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Description
Fixing one cause of
failed to unmarshal jsonfrom the Python SDK sending an empty string instead ofNonewhen a task returns nothingType of change