from_template() — langchain Function Reference

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

Function python PromptManagement ChatTemplates calls 2

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PromptManagement→ ChatTemplates→ from_template() — langchain Function Reference

Dependency Diagram

graph TD
  fb7525a5_49cc_cee5_9a12_dffafec8f35b["from_template()"]
  6be4a9a5_5fe4_e64f_c374_e63767576bf6["ChatPromptTemplate"]
  fb7525a5_49cc_cee5_9a12_dffafec8f35b -->|defined in| 6be4a9a5_5fe4_e64f_c374_e63767576bf6
  868943e8_3763_c08b_6ee7_cd2801948c3a["from_messages()"]
  fb7525a5_49cc_cee5_9a12_dffafec8f35b -->|calls| 868943e8_3763_c08b_6ee7_cd2801948c3a
  6966af16_ade2_de3e_4f06_f97eca43d8e0["from_template()"]
  fb7525a5_49cc_cee5_9a12_dffafec8f35b -->|calls| 6966af16_ade2_de3e_4f06_f97eca43d8e0
  style fb7525a5_49cc_cee5_9a12_dffafec8f35b fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

libs/core/langchain_core/prompts/chat.py lines 1101–1116

    def from_template(cls, template: str, **kwargs: Any) -> ChatPromptTemplate:
        """Create a chat prompt template from a template string.

        Creates a chat template consisting of a single message assumed to be from the
        human.

        Args:
            template: Template string
            **kwargs: Keyword arguments to pass to the constructor.

        Returns:
            A new instance of this class.
        """
        prompt_template = PromptTemplate.from_template(template, **kwargs)
        message = HumanMessagePromptTemplate(prompt=prompt_template)
        return cls.from_messages([message])