Add future annotations to prompt_helper for Python 3.9 compat#20850
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debu-sinha wants to merge 2 commits intorun-llama:mainfrom
Open
Add future annotations to prompt_helper for Python 3.9 compat#20850debu-sinha wants to merge 2 commits intorun-llama:mainfrom
debu-sinha wants to merge 2 commits intorun-llama:mainfrom
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ChatPromptHelper uses PEP 604 union syntax (LLM | None) which raises TypeError at runtime on Python 3.9. Adding the future annotations import makes all type hints lazy strings, fixing the 3.9 test suite.
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prompt_helper.py uses
X | Yunion syntax (PEP 604) which requires Python 3.10+. On Python 3.9, this raisesTypeError: unsupported operand type(s) for |: 'type' and 'type'.Adding
from __future__ import annotationsmakes the type hints lazy-evaluated strings, which fixes the issue on Python 3.9.Found this while investigating the CI failure on #20813 where the Python 3.9 test suite was failing on import.