def main_input(
        self, func: Callable, sig: Signature, bindings: BoundArguments
    ) -> str:
        """Determine (guess) the main input string for a main app call.

        Args:
            func: The main function we are targeting in this determination.

            sig: The signature of the above.

            bindings: The arguments to be passed to the function.

        Returns:
            The main input string.
        """
        return signature_utils.main_input(func, sig, bindings)
Determine (guess) the main input string for a main app call.

        Args:
            func: The main function we are targeting in this determination.

            sig: The signature of the above.

            bindings: The arguments to be passed to the function.

        Returns:
            The main input string.
        
src/core/trulens/core/app.py