langchain.prompts.chat.MessagesPlaceholder¶
- class langchain.prompts.chat.MessagesPlaceholder(*, variable_name: str)[source]¶
Bases:
BaseMessagePromptTemplatePrompt template that assumes variable is already list of messages.
Create a new model by parsing and validating input data from keyword arguments.
Raises ValidationError if the input data cannot be parsed to form a valid model.
- param variable_name: str [Required]¶
Name of variable to use as messages.
- format_messages(**kwargs: Any) List[BaseMessage][source]¶
Format messages from kwargs.
- Parameters
**kwargs – Keyword arguments to use for formatting.
- Returns
List of BaseMessage.
- to_json() Union[SerializedConstructor, SerializedNotImplemented]¶
- to_json_not_implemented() SerializedNotImplemented¶
- property input_variables: List[str]¶
Input variables for this prompt template.
- Returns
List of input variable names.
- property lc_attributes: Dict¶
Return a list of attribute names that should be included in the serialized kwargs. These attributes must be accepted by the constructor.
- property lc_namespace: List[str]¶
Return the namespace of the langchain object. eg. [“langchain”, “llms”, “openai”]
- property lc_secrets: Dict[str, str]¶
Return a map of constructor argument names to secret ids. eg. {“openai_api_key”: “OPENAI_API_KEY”}
- property lc_serializable: bool¶
Whether this object should be serialized.
- Returns
Whether this object should be serialized.