add() — langchain Function Reference

Architecture documentation for the __add__() function in chat.py from the langchain codebase.

Function python LangChainCore LanguageModelBase

Entity Profile

LangChainCore→ LanguageModelBase→ __add__() — langchain Function Reference

Dependency Diagram

graph TD
  34cb5a5b_2a5c_c35e_c787_ad9a6deabb75["__add__()"]
  1418b16b_02b1_1c29_ec3f_d2c27cadc13e["ChatMessageChunk"]
  34cb5a5b_2a5c_c35e_c787_ad9a6deabb75 -->|defined in| 1418b16b_02b1_1c29_ec3f_d2c27cadc13e
  style 34cb5a5b_2a5c_c35e_c787_ad9a6deabb75 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/messages/chat.py lines 35–64

    def __add__(self, other: Any) -> BaseMessageChunk:  # type: ignore[override]
        if isinstance(other, ChatMessageChunk):
            if self.role != other.role:
                msg = "Cannot concatenate ChatMessageChunks with different roles."
                raise ValueError(msg)

            return self.__class__(
                role=self.role,
                content=merge_content(self.content, other.content),
                additional_kwargs=merge_dicts(
                    self.additional_kwargs, other.additional_kwargs
                ),
                response_metadata=merge_dicts(
                    self.response_metadata, other.response_metadata
                ),
                id=self.id,
            )
        if isinstance(other, BaseMessageChunk):
            return self.__class__(
                role=self.role,
                content=merge_content(self.content, other.content),
                additional_kwargs=merge_dicts(
                    self.additional_kwargs, other.additional_kwargs
                ),
                response_metadata=merge_dicts(
                    self.response_metadata, other.response_metadata
                ),
                id=self.id,
            )
        return super().__add__(other)