code: def _load_all_configs(self, paths, values={}):
          
          if not isinstance(values, dict):
              raise TypeError('values must be a dictionary!')
          for p in paths:
              # delegate load of actual config values, then merge with any existing values
              self._merge_values(values, self._load_config(p))
          return values
docs: Loads configuration values for each of the files (from given paths), merging
          duplicate values (e.g. latter values with same keys override earlier values).
          
          @param paths list of config file paths to load
          @param values dictionary to store the loaded values