inspect.getsource

07/09/2025

Return the text of the source code for an object. The argument may be a module, class, method, function, traceback, frame, or code object. The source code is returned as a single string. An OSError is raised if the source code cannot be retrieved. A TypeError is raised if the object is a built-in module, class, or function.


    import inspect

    def foo() -> str:
        """say "foo"
    
        Returns:
            str: "bar"
        """
        return "bar"
    
    if __name__ == "__main__":
        print(inspect.getsource(foo))

        ### def foo() -> str:
        ### """say foo
        ### 
        ### Returns:
        ###     str: "bar"
        ### """
        ### return "bar"

When including code snippets in LLM context engineering, the prompt must be updated every time if the code changes. This approach can lead to context omissions. In such cases, inspect.getsource can be very useful.

asis


    system_prompt = f"""
        The fitness function is a weighted sum value based on the above weights and the components.
        ```python
            final_term = (
                weights.weight_a * fitness_a  
                + weights.weight_b * fitness_b
                + weights.weight_c * fitness_c
                + weights.weight_d * fitness_d
                + weights.weight_e * fitness_e
                + weights.weight_f * fitness_f
                + weights.weight_g * fitness_g 

                (...)

            )
        ```
    """

tobe


    system_prompt = f"""
        The fitness function is a weighted sum value based on the above weights and the components.
        ```python
            {inspect.getsource(get_final_term)}
        ```
    """