The question I hear:

I have a function that performs string interpolation. Without modifying the function, I want to prevent it from doing this interpolation.

Either your question is unclear, or you might as well have asked

I have a function that performs a loop. Without modifying the function, I want to prevent it from doing this loop.

However, I'm pretty sure I'm understanding the problem incorrectly. Please provide more info. A minimal *representative* snippet would be ideal. The snippet you've already provided isn't representative of your problem.