validate_jinja2() — langchain Function Reference

Architecture documentation for the validate_jinja2() function in string.py from the langchain codebase.

Function python PromptManagement ExampleSelection calls 2 called by 1

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PromptManagement→ ExampleSelection→ validate_jinja2() — langchain Function Reference

Dependency Diagram

graph TD
  96cbc2c0_d602_1b32_9641_52ef4f198968["validate_jinja2()"]
  a7a9f16f_a913_8e85_a792_d083dd92c428["string.py"]
  96cbc2c0_d602_1b32_9641_52ef4f198968 -->|defined in| a7a9f16f_a913_8e85_a792_d083dd92c428
  96cbc2c0_d602_1b32_9641_52ef4f198968["validate_jinja2()"]
  96cbc2c0_d602_1b32_9641_52ef4f198968 -->|calls| 96cbc2c0_d602_1b32_9641_52ef4f198968
  96cbc2c0_d602_1b32_9641_52ef4f198968["validate_jinja2()"]
  96cbc2c0_d602_1b32_9641_52ef4f198968 -->|calls| 96cbc2c0_d602_1b32_9641_52ef4f198968
  f53efb83_eef2_e36c_1360_c5fe4961e401["_get_jinja2_variables_from_template()"]
  96cbc2c0_d602_1b32_9641_52ef4f198968 -->|calls| f53efb83_eef2_e36c_1360_c5fe4961e401
  style 96cbc2c0_d602_1b32_9641_52ef4f198968 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/prompts/string.py lines 73–95

def validate_jinja2(template: str, input_variables: list[str]) -> None:
    """Validate that the input variables are valid for the template.

    Issues a warning if missing or extra variables are found.

    Args:
        template: The template string.
        input_variables: The input variables.
    """
    input_variables_set = set(input_variables)
    valid_variables = _get_jinja2_variables_from_template(template)
    missing_variables = valid_variables - input_variables_set
    extra_variables = input_variables_set - valid_variables

    warning_message = ""
    if missing_variables:
        warning_message += f"Missing variables: {missing_variables} "

    if extra_variables:
        warning_message += f"Extra variables: {extra_variables}"

    if warning_message:
        warnings.warn(warning_message.strip(), stacklevel=7)