Temporary modification to global settings in a script

[baloneysammich]

Is there a way to temporarily modify/override global settings in a script? Or is it necessary to store the original values and then revert?

For example, when I do an X/Y plot, I'd like all images to be stored in a subfolder. So I made a copy of modules/xy_grid.py, added an option to input a directory name/pattern:

        subdir_name_pattern = gr.Textbox(label='Directory name pattern', lines=1)

and code to enable Save images to a subdirectory and set Directory name pattern if something is input there:

        if subdir_name_pattern:
               opts.data["save_to_dirs"] = True
               opts.data["directories_filename_pattern"] = subdir_name_pattern

This works but it permanently changes the global settings.