Method from_file

libs/core/langchain_core/prompts/prompt.py:198–222

Load a prompt from a file. Args: template_file: The path to the file containing the prompt template. input_variables: [DEPRECATED] A list of variable names the final prompt template will expect. input_variables is ignored as from_file now del

(
        cls,
        template_file: Union[str, Path],
        input_variables: Optional[List[str]] = None,
        **kwargs: Any,
    )

    @classmethod
    def from_file(
        cls,
        template_file: Union[str, Path],
        input_variables: Optional[List[str]] = None,
        **kwargs: Any,
    ) -> PromptTemplate:
        """Load a prompt from a file.

        Args:
            template_file: The path to the file containing the prompt template.
            input_variables: [DEPRECATED] A list of variable names the final prompt
                template will expect.

        input_variables is ignored as from_file now delegates to from_template().

        Returns:
            The prompt loaded from the file.
        """
        with open(str(template_file), "r") as f:
            template = f.read()
        if input_variables:
            warnings.warn(
                "`input_variables' is deprecated and ignored.", DeprecationWarning
            )
        return cls.from_template(template=template, **kwargs)

    @classmethod
    def from_template(