get_lambda_source() — langchain Function Reference

Architecture documentation for the get_lambda_source() function in utils.py from the langchain codebase.

Function python CoreAbstractions Serialization

Entity Profile

CoreAbstractions→ Serialization→ get_lambda_source() — langchain Function Reference

Dependency Diagram

graph TD
  dedd6508_92ff_3b85_009c_1c8c69daabe9["get_lambda_source()"]
  ca66092c_447c_d201_0d3c_cfa6ca2cc9d3["utils.py"]
  dedd6508_92ff_3b85_009c_1c8c69daabe9 -->|defined in| ca66092c_447c_d201_0d3c_cfa6ca2cc9d3
  style dedd6508_92ff_3b85_009c_1c8c69daabe9 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/runnables/utils.py lines 384–404

def get_lambda_source(func: Callable) -> str | None:
    """Get the source code of a lambda function.

    Args:
        func: a Callable that can be a lambda function.

    Returns:
        the source code of the lambda function.
    """
    try:
        name = func.__name__ if func.__name__ != "<lambda>" else None
    except AttributeError:
        name = None
    try:
        code = inspect.getsource(func)
        tree = ast.parse(textwrap.dedent(code))
        visitor = GetLambdaSource()
        visitor.visit(tree)
    except (SyntaxError, TypeError, OSError, SystemError):
        return name
    return visitor.source if visitor.count == 1 else name