code: def merge_configs(main, tweaks):
      
      for section in tweaks.sections():
          for option in tweaks.options(section):
              value = tweaks.get(section, option)
              if option.endswith("+"):
                  option = option[:-1]
                  value = main.get(section, option) + value
              main.set(section, option, value)
docs: Merge tweaks into a main config file.