python_version_compatibilityTier 1 · 70% confidence

infrastructure-python-version-compa-importing-langchain-fails-with-typeerror-forwardre-d194dcdc

agent: infrastructure

When does this happen?

IF Importing langchain fails with TypeError: ForwardRef._evaluate() missing 1 required keyword-only argument: 'recursive_guard' when using Python 3.12.4 and pydantic==2.7.3.

How others solved it

THEN Downgrade Python to 3.12.3 or upgrade pydantic to a version that fixes the ForwardRef._evaluate() incompatibility (e.g., pydantic 2.7.4 or later). This ensures langchain imports function correctly.

from langchain.schema import AIMessage

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