_get_key() — langchain Function Reference

Architecture documentation for the _get_key() function in string_run_evaluator.py from the langchain codebase.

Function python LangChainCore MessageInterface called by 1

Entity Profile

LangChainCore→ MessageInterface→ _get_key() — langchain Function Reference

Dependency Diagram

graph TD
  299b611e_fb70_d4ca_6dcc_c6031a8162d9["_get_key()"]
  3ac90b6f_675b_ff6a_04b3_989d183b1348["ChainStringRunMapper"]
  299b611e_fb70_d4ca_6dcc_c6031a8162d9 -->|defined in| 3ac90b6f_675b_ff6a_04b3_989d183b1348
  b8c4bf91_87d7_ce69_1350_1bcdf1bccbbb["map()"]
  b8c4bf91_87d7_ce69_1350_1bcdf1bccbbb -->|calls| 299b611e_fb70_d4ca_6dcc_c6031a8162d9
  style 299b611e_fb70_d4ca_6dcc_c6031a8162d9 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/smith/evaluation/string_run_evaluator.py lines 168–177

    def _get_key(self, source: dict, key: str | None, which: str) -> str:
        if key is not None:
            return source[key]
        if len(source) == 1:
            return next(iter(source.values()))
        msg = (
            f"Could not map run {which} with multiple keys: "
            f"{source}\nPlease manually specify a {which}_key"
        )
        raise ValueError(msg)