mirror of
https://github.com/hwchase17/langchain
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25 lines
1016 B
Python
25 lines
1016 B
Python
import importlib
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import sys
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## Create namespaces for pydantic v1 and v2.
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# This code must stay at the top of the file before other modules may
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# attempt to import pydantic since it adds pydantic_v1 and pydantic_v2 to sys.modules.
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#
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# This hack is done for the following reasons:
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# * Langchain will attempt to remain compatible with both pydantic v1 and v2 since
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# both dependencies and dependents may be stuck on either version of v1 or v2.
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# * Creating namespaces for pydantic v1 and v2 should allow us to write code that
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# unambiguously uses either v1 or v2 API.
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# * This change is easier to roll out and roll back.
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try:
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pydantic_v1 = importlib.import_module("pydantic.v1")
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except ImportError:
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pydantic_v1 = importlib.import_module("pydantic")
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if "pydantic_v1" not in sys.modules:
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# Use a conditional because langchain experimental
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# will use the same strategy to add pydantic_v1 to sys.modules
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# and may run prior to langchain core package.
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sys.modules["pydantic_v1"] = pydantic_v1
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