Python 3.12.4 is incompatible with pydantic.v1 as of pydantic==2.7.3

[znruss]

Checked other resources

• [X] I added a very descriptive title to this issue.
• [X] I searched the LangChain documentation with the integrated search.
• [X] I used the GitHub search to find a similar question and didn't find it.
• [X] I am sure that this is a bug in LangChain rather than my code.
• [X] The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

from langchain.schema import AIMessage

Error Message and Stack Trace (if applicable)

Traceback (most recent call last):
  File "/code/test.py", line 1, in <module>
    from langchain.schema import AIMessage
  File "/usr/local/lib/python3.12/site-packages/langchain/schema/__init__.py", line 5, in <module>
    from langchain_core.documents import BaseDocumentTransformer, Document
  File "/usr/local/lib/python3.12/site-packages/langchain_core/documents/__init__.py", line 6, in <module>
    from langchain_core.documents.compressor import BaseDocumentCompressor
  File "/usr/local/lib/python3.12/site-packages/langchain_core/documents/compressor.py", line 6, in <module>
    from langchain_core.callbacks import Callbacks
  File "/usr/local/lib/python3.12/site-packages/langchain_core/callbacks/__init__.py", line 22, in <module>
    from langchain_core.callbacks.manager import (
  File "/usr/local/lib/python3.12/site-packages/langchain_core/callbacks/manager.py", line 29, in <module>
    from langsmith.run_helpers import get_run_tree_context
  File "/usr/local/lib/python3.12/site-packages/langsmith/run_helpers.py", line 40, in <module>
    from langsmith import client as ls_client
  File "/usr/local/lib/python3.12/site-packages/langsmith/client.py", line 52, in <module>
    from langsmith import env as ls_env
  File "/usr/local/lib/python3.12/site-packages/langsmith/env/__init__.py", line 3, in <module>
    from langsmith.env._runtime_env import (
  File "/usr/local/lib/python3.12/site-packages/langsmith/env/_runtime_env.py", line 10, in <module>
    from langsmith.utils import get_docker_compose_command
  File "/usr/local/lib/python3.12/site-packages/langsmith/utils.py", line 31, in <module>
    from langsmith import schemas as ls_schemas
  File "/usr/local/lib/python3.12/site-packages/langsmith/schemas.py", line 69, in <module>
    class Example(ExampleBase):
  File "/usr/local/lib/python3.12/site-packages/pydantic/v1/main.py", line 286, in __new__
    cls.__try_update_forward_refs__()
  File "/usr/local/lib/python3.12/site-packages/pydantic/v1/main.py", line 807, in __try_update_forward_refs__
    update_model_forward_refs(cls, cls.__fields__.values(), cls.__config__.json_encoders, localns, (NameError,))
  File "/usr/local/lib/python3.12/site-packages/pydantic/v1/typing.py", line 554, in update_model_forward_refs
    update_field_forward_refs(f, globalns=globalns, localns=localns)
  File "/usr/local/lib/python3.12/site-packages/pydantic/v1/typing.py", line 520, in update_field_forward_refs
    field.type_ = evaluate_forwardref(field.type_, globalns, localns or None)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pydantic/v1/typing.py", line 66, in evaluate_forwardref
    return cast(Any, type_)._evaluate(globalns, localns, set())
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: ForwardRef._evaluate() missing 1 required keyword-only argument: 'recursive_guard'

Description

Langchain fails on import with Python 3.12.4 due to pydantic v1 dependency. Python 3.12.3 is fine.

See https://github.com/pydantic/pydantic/issues/9607 for more info.

System Info

langchain                0.2.3
langchain-community      0.2.3
langchain-core           0.2.5
langchain-openai         0.1.8
pydantic                 2.7.3
pydantic_core            2.18.4

Python version is 3.12.4

Linux Arm64/v8

[tarvindersi]

I am using Python 3.12.3 and still having the same issue.

[vkadel1111]

I am using Python 3.12.3 and still having the same issue.

I see the same error with 3.12.3 I'm using the 3.12-slim-bullseye. Is there any workaround?

[znruss]

Interesting. Check that your pydantic/pydantic core is the same version (2.7.3). For base image I'm using 3.12.3-slim arm64v8. Otherwise Pydantic seem to do weekly patches so perhaps (2.7.4) will fix it for you when it comes out. This guy had an additional insight. https://github.com/pydantic/pydantic/pull/9612#issuecomment-2158399679

[tarvindersi]

I am on pydantic 2.7.3. Thank you very much for your reply and pointers. Fingers crossed. I tried downloading a requirements.txt file from a published project and matched everything to it but no luck. It is possible they were using different python version (other than 3.12.3).

[dennicLiu]

The issue still persists.

[housejester]

I am using Python 3.12.3 and still having the same issue.

I see the same error with 3.12.3 I'm using the 3.12-slim-bullseye. Is there any workaround?

I believe the docker images for 3.12-slim-* got bumped to using 3.12.4 a few days ago. Pinning to 3.12.3-slim worked for me.

[namiraprita]

I'm also using Python 3.12.3 and still having the same issue.

[znruss]

I am using Python 3.12.3 and still having the same issue.

I see the same error with 3.12.3 I'm using the 3.12-slim-bullseye. Is there any workaround?

I believe the docker images for 3.12-slim-* got bumped to using 3.12.4 a few days ago. Pinning to 3.12.3-slim worked for me.

Correct - that's how we found this problem. We solved it by pinning the base docker image to 3.12.3-slim as well.

[gbaian10]

Update pydantic to 2.7.4 will solve the problem.