python_dependency_conflictTier 1 · 70% confidence

infrastructure-python-dependency-co-importing-langchain-fails-with-typeerror-forwardre-76c3bfc0

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.x and pydantic==2.7.3.

How others solved it

THEN Downgrade Python to 3.12.3 or upgrade pydantic to version 2.7.4 or later to resolve the incompatibility. The error originates from pydantic v1's forward reference handling being broken in Python 3.12.4, but also occurs with pydantic==2.7.3 on Python 3.12.3.

pip install "pydantic>=2.7.4"

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