StringPromptValue Class — langchain Architecture

Architecture documentation for the StringPromptValue class in prompt_values.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  160bdb5d_db6e_0f75_341a_120e781bc026["StringPromptValue"]
  7deca977_9668_e807_4e77_0bc4519c0bfb["PromptValue"]
  160bdb5d_db6e_0f75_341a_120e781bc026 -->|extends| 7deca977_9668_e807_4e77_0bc4519c0bfb
  94d98b96_b32c_774d_c6fe_549a7fddfb68["prompt_values.py"]
  160bdb5d_db6e_0f75_341a_120e781bc026 -->|defined in| 94d98b96_b32c_774d_c6fe_549a7fddfb68
  3693f69f_a994_3e91_82e5_0f48cb9140e1["get_lc_namespace()"]
  160bdb5d_db6e_0f75_341a_120e781bc026 -->|method| 3693f69f_a994_3e91_82e5_0f48cb9140e1
  0db1cfdc_c563_7743_8dd1_78c286d27a4e["to_string()"]
  160bdb5d_db6e_0f75_341a_120e781bc026 -->|method| 0db1cfdc_c563_7743_8dd1_78c286d27a4e
  72d96c31_869c_6492_ef96_d020fcf3e99e["to_messages()"]
  160bdb5d_db6e_0f75_341a_120e781bc026 -->|method| 72d96c31_869c_6492_ef96_d020fcf3e99e

Relationship Graph

Source Code

libs/core/langchain_core/prompt_values.py lines 54–77

class StringPromptValue(PromptValue):
    """String prompt value."""

    text: str
    """Prompt text."""

    type: Literal["StringPromptValue"] = "StringPromptValue"

    @classmethod
    def get_lc_namespace(cls) -> list[str]:
        """Get the namespace of the LangChain object.

        Returns:
            `["langchain", "prompts", "base"]`
        """
        return ["langchain", "prompts", "base"]

    def to_string(self) -> str:
        """Return prompt as string."""
        return self.text

    def to_messages(self) -> list[BaseMessage]:
        """Return prompt as messages."""
        return [HumanMessage(content=self.text)]