langchain[patch]: Upgrade pydantic extra (#25186)

Upgrade to using a literal for specifying the extra which is the
recommended approach in pydantic 2.

This works correctly also in pydantic v1.

```python
from pydantic.v1 import BaseModel

class Foo(BaseModel, extra="forbid"):
    x: int

Foo(x=5, y=1)
```

And 


```python
from pydantic.v1 import BaseModel

class Foo(BaseModel):
    x: int

    class Config:
      extra = "forbid"

Foo(x=5, y=1)
```


## Enum -> literal using grit pattern:

```
engine marzano(0.1)
language python
or {
    `extra=Extra.allow` => `extra="allow"`,
    `extra=Extra.forbid` => `extra="forbid"`,
    `extra=Extra.ignore` => `extra="ignore"`
}
```

Resorted attributes in config and removed doc-string in case we will
need to deal with going back and forth between pydantic v1 and v2 during
the 0.3 release. (This will reduce merge conflicts.)


## Sort attributes in Config:

```
engine marzano(0.1)
language python


function sort($values) js {
    return $values.text.split(',').sort().join("\n");
}


class_definition($name, $body) as $C where {
    $name <: `Config`,
    $body <: block($statements),
    $values = [],
    $statements <: some bubble($values) assignment() as $A where {
        $values += $A
    },
    $body => sort($values),
}

```

libs/langchain/langchain/agents/agent.py

@@ -420,8 +420,6 @@ class RunnableAgent(BaseSingleActionAgent):
     """
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
     @property
@@ -530,8 +528,6 @@ class RunnableMultiActionAgent(BaseMultiActionAgent):
     """
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
     @property

libs/langchain/langchain/agents/agent_toolkits/vectorstore/toolkit.py

@@ -16,8 +16,6 @@ class VectorStoreInfo(BaseModel):
     description: str
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
 
@@ -28,8 +26,6 @@ class VectorStoreToolkit(BaseToolkit):
     llm: BaseLanguageModel
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
     def get_tools(self) -> List[BaseTool]:
@@ -71,8 +67,6 @@ class VectorStoreRouterToolkit(BaseToolkit):
     llm: BaseLanguageModel
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
     def get_tools(self) -> List[BaseTool]:

libs/langchain/langchain/chains/base.py

@@ -97,8 +97,6 @@ class Chain(RunnableSerializable[Dict[str, Any], Dict[str, Any]], ABC):
     """[DEPRECATED] Use `callbacks` instead."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
     def get_input_schema(

libs/langchain/langchain/chains/combine_documents/map_reduce.py

@@ -6,7 +6,7 @@ from typing import Any, Dict, List, Optional, Tuple, Type
 
 from langchain_core.callbacks import Callbacks
 from langchain_core.documents import Document
-from langchain_core.pydantic_v1 import BaseModel, Extra, root_validator
+from langchain_core.pydantic_v1 import BaseModel, root_validator
 from langchain_core.runnables.config import RunnableConfig
 from langchain_core.runnables.utils import create_model
 
@@ -127,10 +127,8 @@ class MapReduceDocumentsChain(BaseCombineDocumentsChain):
         return _output_keys
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @root_validator(pre=True)
     def get_reduce_chain(cls, values: Dict) -> Dict:

libs/langchain/langchain/chains/combine_documents/map_rerank.py

@@ -6,7 +6,7 @@ from typing import Any, Dict, List, Optional, Sequence, Tuple, Type, Union, cast
 
 from langchain_core.callbacks import Callbacks
 from langchain_core.documents import Document
-from langchain_core.pydantic_v1 import BaseModel, Extra, root_validator
+from langchain_core.pydantic_v1 import BaseModel, root_validator
 from langchain_core.runnables.config import RunnableConfig
 from langchain_core.runnables.utils import create_model
 
@@ -75,10 +75,8 @@ class MapRerankDocumentsChain(BaseCombineDocumentsChain):
     Intermediate steps include the results of calling llm_chain on each document."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     def get_output_schema(
         self, config: Optional[RunnableConfig] = None

libs/langchain/langchain/chains/combine_documents/reduce.py

@@ -6,7 +6,6 @@ from typing import Any, Callable, List, Optional, Protocol, Tuple
 
 from langchain_core.callbacks import Callbacks
 from langchain_core.documents import Document
-from langchain_core.pydantic_v1 import Extra
 
 from langchain.chains.combine_documents.base import BaseCombineDocumentsChain
 
@@ -206,10 +205,8 @@ class ReduceDocumentsChain(BaseCombineDocumentsChain):
     Otherwise, after it reaches the max number, it will throw an error"""
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def _collapse_chain(self) -> BaseCombineDocumentsChain:

libs/langchain/langchain/chains/combine_documents/refine.py

@@ -8,7 +8,7 @@ from langchain_core.callbacks import Callbacks
 from langchain_core.documents import Document
 from langchain_core.prompts import BasePromptTemplate, format_document
 from langchain_core.prompts.prompt import PromptTemplate
-from langchain_core.pydantic_v1 import Extra, Field, root_validator
+from langchain_core.pydantic_v1 import Field, root_validator
 
 from langchain.chains.combine_documents.base import (
     BaseCombineDocumentsChain,
@@ -99,10 +99,8 @@ class RefineDocumentsChain(BaseCombineDocumentsChain):
         return _output_keys
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @root_validator(pre=True)
     def get_return_intermediate_steps(cls, values: Dict) -> Dict:

libs/langchain/langchain/chains/combine_documents/stuff.py

@@ -7,7 +7,7 @@ from langchain_core.documents import Document
 from langchain_core.language_models import LanguageModelLike
 from langchain_core.output_parsers import BaseOutputParser, StrOutputParser
 from langchain_core.prompts import BasePromptTemplate, format_document
-from langchain_core.pydantic_v1 import Extra, Field, root_validator
+from langchain_core.pydantic_v1 import Field, root_validator
 from langchain_core.runnables import Runnable, RunnablePassthrough
 
 from langchain.chains.combine_documents.base import (
@@ -147,10 +147,8 @@ class StuffDocumentsChain(BaseCombineDocumentsChain):
     """The string with which to join the formatted documents"""
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @root_validator(pre=True)
     def get_default_document_variable_name(cls, values: Dict) -> Dict:

libs/langchain/langchain/chains/conversation/base.py

@@ -5,7 +5,7 @@ from typing import Dict, List
 from langchain_core._api import deprecated
 from langchain_core.memory import BaseMemory
 from langchain_core.prompts import BasePromptTemplate
-from langchain_core.pydantic_v1 import Extra, Field, root_validator
+from langchain_core.pydantic_v1 import Field, root_validator
 
 from langchain.chains.conversation.prompt import PROMPT
 from langchain.chains.llm import LLMChain
@@ -111,10 +111,8 @@ class ConversationChain(LLMChain):
     output_key: str = "response"  #: :meta private:
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @classmethod
     def is_lc_serializable(cls) -> bool:

libs/langchain/langchain/chains/conversational_retrieval/base.py

@@ -18,7 +18,7 @@ from langchain_core.documents import Document
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.messages import BaseMessage
 from langchain_core.prompts import BasePromptTemplate
-from langchain_core.pydantic_v1 import BaseModel, Extra, Field, root_validator
+from langchain_core.pydantic_v1 import BaseModel, Field, root_validator
 from langchain_core.retrievers import BaseRetriever
 from langchain_core.runnables import RunnableConfig
 from langchain_core.vectorstores import VectorStore
@@ -97,11 +97,9 @@ class BaseConversationalRetrievalChain(Chain):
     are found for the question. """
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
-        arbitrary_types_allowed = True
         allow_population_by_field_name = True
+        arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def input_keys(self) -> List[str]:

libs/langchain/langchain/chains/elasticsearch_database/base.py

@@ -9,7 +9,7 @@ from langchain_core.language_models import BaseLanguageModel
 from langchain_core.output_parsers import BaseLLMOutputParser
 from langchain_core.output_parsers.json import SimpleJsonOutputParser
 from langchain_core.prompts import BasePromptTemplate
-from langchain_core.pydantic_v1 import Extra, root_validator
+from langchain_core.pydantic_v1 import root_validator
 
 from langchain.chains.base import Chain
 from langchain.chains.elasticsearch_database.prompts import ANSWER_PROMPT, DSL_PROMPT
@@ -52,10 +52,8 @@ class ElasticsearchDatabaseChain(Chain):
     """Whether or not to return the intermediate steps along with the final answer."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @root_validator(pre=False, skip_on_failure=True)
     def validate_indices(cls, values: dict) -> dict:

libs/langchain/langchain/chains/hyde/base.py

@@ -12,7 +12,6 @@ from langchain_core.callbacks import CallbackManagerForChainRun
 from langchain_core.embeddings import Embeddings
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import BasePromptTemplate
-from langchain_core.pydantic_v1 import Extra
 
 from langchain.chains.base import Chain
 from langchain.chains.hyde.prompts import PROMPT_MAP
@@ -29,10 +28,8 @@ class HypotheticalDocumentEmbedder(Chain, Embeddings):
     llm_chain: LLMChain
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def input_keys(self) -> List[str]:

libs/langchain/langchain/chains/llm.py

@@ -23,7 +23,7 @@ from langchain_core.output_parsers import BaseLLMOutputParser, StrOutputParser
 from langchain_core.outputs import ChatGeneration, Generation, LLMResult
 from langchain_core.prompt_values import PromptValue
 from langchain_core.prompts import BasePromptTemplate, PromptTemplate
-from langchain_core.pydantic_v1 import Extra, Field
+from langchain_core.pydantic_v1 import Field
 from langchain_core.runnables import (
     Runnable,
     RunnableBinding,
@@ -96,10 +96,8 @@ class LLMChain(Chain):
     llm_kwargs: dict = Field(default_factory=dict)
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def input_keys(self) -> List[str]:

libs/langchain/langchain/chains/llm_checker/base.py

@@ -8,7 +8,7 @@ from typing import Any, Dict, List, Optional
 from langchain_core.callbacks import CallbackManagerForChainRun
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import PromptTemplate
-from langchain_core.pydantic_v1 import Extra, root_validator
+from langchain_core.pydantic_v1 import root_validator
 
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
@@ -91,10 +91,8 @@ class LLMCheckerChain(Chain):
     output_key: str = "result"  #: :meta private:
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @root_validator(pre=True)
     def raise_deprecation(cls, values: Dict) -> Dict:

libs/langchain/langchain/chains/llm_math/base.py

@@ -13,7 +13,7 @@ from langchain_core.callbacks import (
 )
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import BasePromptTemplate
-from langchain_core.pydantic_v1 import Extra, root_validator
+from langchain_core.pydantic_v1 import root_validator
 
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
@@ -40,10 +40,8 @@ class LLMMathChain(Chain):
     output_key: str = "answer"  #: :meta private:
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @root_validator(pre=True)
     def raise_deprecation(cls, values: Dict) -> Dict:

libs/langchain/langchain/chains/llm_summarization_checker/base.py

@@ -9,7 +9,7 @@ from typing import Any, Dict, List, Optional
 from langchain_core.callbacks import CallbackManagerForChainRun
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts.prompt import PromptTemplate
-from langchain_core.pydantic_v1 import Extra, root_validator
+from langchain_core.pydantic_v1 import root_validator
 
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
@@ -96,10 +96,8 @@ class LLMSummarizationCheckerChain(Chain):
     """Maximum number of times to check the assertions. Default to double-checking."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @root_validator(pre=True)
     def raise_deprecation(cls, values: Dict) -> Dict:

libs/langchain/langchain/chains/mapreduce.py

@@ -12,7 +12,6 @@ from langchain_core.callbacks import CallbackManagerForChainRun, Callbacks
 from langchain_core.documents import Document
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import BasePromptTemplate
-from langchain_core.pydantic_v1 import Extra
 from langchain_text_splitters import TextSplitter
 
 from langchain.chains import ReduceDocumentsChain
@@ -68,10 +67,8 @@ class MapReduceChain(Chain):
         )
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def input_keys(self) -> List[str]:

libs/langchain/langchain/chains/natbot/base.py

@@ -7,7 +7,7 @@ from typing import Any, Dict, List, Optional
 
 from langchain_core.callbacks import CallbackManagerForChainRun
 from langchain_core.language_models import BaseLanguageModel
-from langchain_core.pydantic_v1 import Extra, root_validator
+from langchain_core.pydantic_v1 import root_validator
 
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
@@ -48,10 +48,8 @@ class NatBotChain(Chain):
     output_key: str = "command"  #: :meta private:
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @root_validator(pre=True)
     def raise_deprecation(cls, values: Dict) -> Dict:

libs/langchain/langchain/chains/qa_with_sources/base.py

@@ -14,7 +14,7 @@ from langchain_core.callbacks import (
 from langchain_core.documents import Document
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import BasePromptTemplate
-from langchain_core.pydantic_v1 import Extra, root_validator
+from langchain_core.pydantic_v1 import root_validator
 
 from langchain.chains import ReduceDocumentsChain
 from langchain.chains.base import Chain
@@ -88,10 +88,8 @@ class BaseQAWithSourcesChain(Chain, ABC):
         return cls(combine_documents_chain=combine_documents_chain, **kwargs)
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def input_keys(self) -> List[str]:

libs/langchain/langchain/chains/query_constructor/schema.py

@@ -9,7 +9,5 @@ class AttributeInfo(BaseModel):
     type: str
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
         frozen = True

libs/langchain/langchain/chains/retrieval_qa/base.py

@@ -16,7 +16,7 @@ from langchain_core.callbacks import (
 from langchain_core.documents import Document
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import PromptTemplate
-from langchain_core.pydantic_v1 import Extra, Field, root_validator
+from langchain_core.pydantic_v1 import Field, root_validator
 from langchain_core.retrievers import BaseRetriever
 from langchain_core.vectorstores import VectorStore
 
@@ -39,11 +39,9 @@ class BaseRetrievalQA(Chain):
     """Return the source documents or not."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
-        arbitrary_types_allowed = True
         allow_population_by_field_name = True
+        arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def input_keys(self) -> List[str]:

libs/langchain/langchain/chains/router/base.py

@@ -10,7 +10,6 @@ from langchain_core.callbacks import (
     CallbackManagerForChainRun,
     Callbacks,
 )
-from langchain_core.pydantic_v1 import Extra
 
 from langchain.chains.base import Chain
 
@@ -62,10 +61,8 @@ class MultiRouteChain(Chain):
     Defaults to False."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def input_keys(self) -> List[str]:

libs/langchain/langchain/chains/router/embedding_router.py

@@ -8,7 +8,6 @@ from langchain_core.callbacks import (
 )
 from langchain_core.documents import Document
 from langchain_core.embeddings import Embeddings
-from langchain_core.pydantic_v1 import Extra
 from langchain_core.vectorstores import VectorStore
 
 from langchain.chains.router.base import RouterChain
@@ -21,10 +20,8 @@ class EmbeddingRouterChain(RouterChain):
     routing_keys: List[str] = ["query"]
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def input_keys(self) -> List[str]:

libs/langchain/langchain/chains/sequential.py

@@ -6,7 +6,7 @@ from langchain_core.callbacks import (
     AsyncCallbackManagerForChainRun,
     CallbackManagerForChainRun,
 )
-from langchain_core.pydantic_v1 import Extra, root_validator
+from langchain_core.pydantic_v1 import root_validator
 from langchain_core.utils.input import get_color_mapping
 
 from langchain.chains.base import Chain
@@ -21,10 +21,8 @@ class SequentialChain(Chain):
     return_all: bool = False
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def input_keys(self) -> List[str]:
@@ -132,10 +130,8 @@ class SimpleSequentialChain(Chain):
     output_key: str = "output"  #: :meta private:
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @property
     def input_keys(self) -> List[str]:

libs/langchain/langchain/evaluation/agents/trajectory_eval_chain.py

@@ -28,7 +28,7 @@ from langchain_core.exceptions import OutputParserException
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.language_models.chat_models import BaseChatModel
 from langchain_core.output_parsers import BaseOutputParser
-from langchain_core.pydantic_v1 import Extra, Field
+from langchain_core.pydantic_v1 import Field
 from langchain_core.tools import BaseTool
 
 from langchain.chains.llm import LLMChain
@@ -157,9 +157,7 @@ class TrajectoryEvalChain(AgentTrajectoryEvaluator, LLMEvalChain):
     """DEPRECATED. Reasoning always returned."""
 
     class Config:
-        """Configuration for the QAEvalChain."""
+        extra = "ignore"
-
-        extra = Extra.ignore
 
     @property
     def requires_reference(self) -> bool:

libs/langchain/langchain/evaluation/comparison/eval_chain.py

@@ -10,7 +10,7 @@ from langchain_core.callbacks.manager import Callbacks
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.output_parsers import BaseOutputParser
 from langchain_core.prompts.prompt import PromptTemplate
-from langchain_core.pydantic_v1 import Extra, Field
+from langchain_core.pydantic_v1 import Field
 
 from langchain.chains.constitutional_ai.models import ConstitutionalPrinciple
 from langchain.chains.llm import LLMChain
@@ -192,9 +192,7 @@ class PairwiseStringEvalChain(PairwiseStringEvaluator, LLMEvalChain, LLMChain):
         return False
 
     class Config:
-        """Configuration for the PairwiseStringEvalChain."""
+        extra = "ignore"
-
-        extra = Extra.ignore
 
     @property
     def requires_reference(self) -> bool:

libs/langchain/langchain/evaluation/criteria/eval_chain.py

@@ -8,7 +8,7 @@ from langchain_core.callbacks.manager import Callbacks
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.output_parsers import BaseOutputParser
 from langchain_core.prompts import BasePromptTemplate
-from langchain_core.pydantic_v1 import Extra, Field
+from langchain_core.pydantic_v1 import Field
 
 from langchain.chains.constitutional_ai.models import ConstitutionalPrinciple
 from langchain.chains.llm import LLMChain
@@ -237,9 +237,7 @@ class CriteriaEvalChain(StringEvaluator, LLMEvalChain, LLMChain):
         return False
 
     class Config:
-        """Configuration for the QAEvalChain."""
+        extra = "ignore"
-
-        extra = Extra.ignore
 
     @property
     def requires_reference(self) -> bool:

libs/langchain/langchain/evaluation/embedding_distance/base.py

@@ -114,8 +114,6 @@ class _EmbeddingDistanceChainMixin(Chain):
         return values
 
     class Config:
-        """Permit embeddings to go unvalidated."""
-
         arbitrary_types_allowed: bool = True
 
     @property

libs/langchain/langchain/evaluation/qa/eval_chain.py

@@ -9,7 +9,6 @@ from typing import Any, List, Optional, Sequence, Tuple
 from langchain_core.callbacks.manager import Callbacks
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts import PromptTemplate
-from langchain_core.pydantic_v1 import Extra
 
 from langchain.chains.llm import LLMChain
 from langchain.evaluation.qa.eval_prompt import CONTEXT_PROMPT, COT_PROMPT, PROMPT
@@ -74,9 +73,7 @@ class QAEvalChain(LLMChain, StringEvaluator, LLMEvalChain):
     output_key: str = "results"  #: :meta private:
 
     class Config:
-        """Configuration for the QAEvalChain."""
+        extra = "ignore"
-
-        extra = Extra.ignore
 
     @classmethod
     def is_lc_serializable(cls) -> bool:
@@ -224,9 +221,7 @@ class ContextQAEvalChain(LLMChain, StringEvaluator, LLMEvalChain):
         return True
 
     class Config:
-        """Configuration for the QAEvalChain."""
+        extra = "ignore"
-
-        extra = Extra.ignore
 
     @classmethod
     def _validate_input_vars(cls, prompt: PromptTemplate) -> None:

libs/langchain/langchain/evaluation/scoring/eval_chain.py

@@ -10,7 +10,7 @@ from langchain_core.callbacks.manager import Callbacks
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.output_parsers import BaseOutputParser
 from langchain_core.prompts.prompt import PromptTemplate
-from langchain_core.pydantic_v1 import Extra, Field
+from langchain_core.pydantic_v1 import Field
 
 from langchain.chains.constitutional_ai.models import ConstitutionalPrinciple
 from langchain.chains.llm import LLMChain
@@ -180,9 +180,7 @@ class ScoreStringEvalChain(StringEvaluator, LLMEvalChain, LLMChain):
     """The name of the criterion being evaluated."""
 
     class Config:
-        """Configuration for the ScoreStringEvalChain."""
+        extra = "ignore"
-
-        extra = Extra.ignore
 
     @classmethod
     def is_lc_serializable(cls) -> bool:

libs/langchain/langchain/indexes/vectorstore.py

@@ -4,7 +4,7 @@ from langchain_core.document_loaders import BaseLoader
 from langchain_core.documents import Document
 from langchain_core.embeddings import Embeddings
 from langchain_core.language_models import BaseLanguageModel
-from langchain_core.pydantic_v1 import BaseModel, Extra, Field
+from langchain_core.pydantic_v1 import BaseModel, Field
 from langchain_core.vectorstores import VectorStore
 from langchain_text_splitters import RecursiveCharacterTextSplitter, TextSplitter
 
@@ -22,10 +22,8 @@ class VectorStoreIndexWrapper(BaseModel):
     vectorstore: VectorStore
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     def query(
         self,
@@ -145,10 +143,8 @@ class VectorstoreIndexCreator(BaseModel):
     vectorstore_kwargs: dict = Field(default_factory=dict)
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     def from_loaders(self, loaders: List[BaseLoader]) -> VectorStoreIndexWrapper:
         """Create a vectorstore index from loaders."""

libs/langchain/langchain/memory/entity.py

@@ -246,8 +246,6 @@ class SQLiteEntityStore(BaseEntityStore):
     conn: Any = None
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
     def __init__(

libs/langchain/langchain/retrievers/contextual_compression.py

@@ -22,8 +22,6 @@ class ContextualCompressionRetriever(BaseRetriever):
     """Base Retriever to use for getting relevant documents."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
     def _get_relevant_documents(

libs/langchain/langchain/retrievers/document_compressors/base.py

@@ -16,8 +16,6 @@ class DocumentCompressorPipeline(BaseDocumentCompressor):
     """List of document filters that are chained together and run in sequence."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
     def compress_documents(

libs/langchain/langchain/retrievers/document_compressors/cohere_rerank.py

@@ -6,7 +6,7 @@ from typing import Any, Dict, List, Optional, Sequence, Union
 from langchain_core._api.deprecation import deprecated
 from langchain_core.callbacks.manager import Callbacks
 from langchain_core.documents import Document
-from langchain_core.pydantic_v1 import Extra, root_validator
+from langchain_core.pydantic_v1 import root_validator
 from langchain_core.utils import get_from_dict_or_env
 
 from langchain.retrievers.document_compressors.base import BaseDocumentCompressor
@@ -31,10 +31,8 @@ class CohereRerank(BaseDocumentCompressor):
     """Identifier for the application making the request."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     @root_validator(pre=True)
     def validate_environment(cls, values: Dict) -> Dict:

libs/langchain/langchain/retrievers/document_compressors/cross_encoder_rerank.py

@@ -5,7 +5,6 @@ from typing import Optional, Sequence
 
 from langchain_core.callbacks import Callbacks
 from langchain_core.documents import BaseDocumentCompressor, Document
-from langchain_core.pydantic_v1 import Extra
 
 from langchain.retrievers.document_compressors.cross_encoder import BaseCrossEncoder
 
@@ -20,10 +19,8 @@ class CrossEncoderReranker(BaseDocumentCompressor):
     """Number of documents to return."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        extra = Extra.forbid
         arbitrary_types_allowed = True
+        extra = "forbid"
 
     def compress_documents(
         self,

libs/langchain/langchain/retrievers/document_compressors/embeddings_filter.py

@@ -42,8 +42,6 @@ class EmbeddingsFilter(BaseDocumentCompressor):
     to None."""
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
     @pre_init

libs/langchain/langchain/retrievers/self_query/base.py

@@ -215,10 +215,8 @@ class SelfQueryRetriever(BaseRetriever):
     """Use original query instead of the revised new query from LLM"""
 
     class Config:
-        """Configuration for this pydantic object."""
-
-        arbitrary_types_allowed = True
         allow_population_by_field_name = True
+        arbitrary_types_allowed = True
 
     @root_validator(pre=True)
     def validate_translator(cls, values: Dict) -> Dict:

libs/langchain/langchain/retrievers/time_weighted_retriever.py

@@ -47,8 +47,6 @@ class TimeWeightedVectorStoreRetriever(BaseRetriever):
     """
 
     class Config:
-        """Configuration for this pydantic object."""
-
         arbitrary_types_allowed = True
 
     def _document_get_date(self, field: str, document: Document) -> datetime.datetime:

libs/langchain/tests/unit_tests/load/test_dump.py

@@ -85,8 +85,6 @@ class TestClass(Serializable):
     my_other_secret: str = Field()
 
     class Config:
-        """Configuration for this pydantic object."""
-
         allow_population_by_field_name = True
 
     @root_validator(pre=True)