from_template_file() — langchain Function Reference

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

Function python PromptManagement ChatTemplates calls 2 called by 1

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PromptManagement→ ChatTemplates→ from_template_file() — langchain Function Reference

Dependency Diagram

graph TD
  2d45b52a_4608_cd37_32ee_8262977a52f4["from_template_file()"]
  894611e5_5039_7621_4673_821d0b9b6f17["_StringImageMessagePromptTemplate"]
  2d45b52a_4608_cd37_32ee_8262977a52f4 -->|defined in| 894611e5_5039_7621_4673_821d0b9b6f17
  99bde657_97b6_c8a5_899c_2b894c683f03["from_template_file()"]
  99bde657_97b6_c8a5_899c_2b894c683f03 -->|calls| 2d45b52a_4608_cd37_32ee_8262977a52f4
  99bde657_97b6_c8a5_899c_2b894c683f03["from_template_file()"]
  2d45b52a_4608_cd37_32ee_8262977a52f4 -->|calls| 99bde657_97b6_c8a5_899c_2b894c683f03
  6966af16_ade2_de3e_4f06_f97eca43d8e0["from_template()"]
  2d45b52a_4608_cd37_32ee_8262977a52f4 -->|calls| 6966af16_ade2_de3e_4f06_f97eca43d8e0
  style 2d45b52a_4608_cd37_32ee_8262977a52f4 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/prompts/chat.py lines 532–549

    def from_template_file(
        cls: type[Self],
        template_file: str | Path,
        input_variables: list[str],
        **kwargs: Any,
    ) -> Self:
        """Create a class from a template file.

        Args:
            template_file: path to a template file.
            input_variables: list of input variables.
            **kwargs: Keyword arguments to pass to the constructor.

        Returns:
            A new instance of this class.
        """
        template = Path(template_file).read_text(encoding="utf-8")
        return cls.from_template(template, input_variables=input_variables, **kwargs)