docs: def _load(self, file_path: Text) -> None:
          """
          Load the configuration from a plain Python file. This file is executed
          on its own.
  
          Only keys matching the CONFIG_ATTR will be loaded. Basically, it's
          CONFIG_KEYS_LIKE_THIS.
  
          :param file_path: Path to the file to load
          """
  
          # noinspection PyUnresolvedReferences
          module_ = types.ModuleType('settings')
          module_.__file__ = file_path
  
          try:
              with open(file_path, encoding='utf-8') as f:
                  exec(compile(f.read(), file_path, 'exec'), module_.__dict__)
          except IOError as e:
              e.strerror = 'Unable to load configuration file ({})'\
                  .format(e.strerror)
              raise
  
          for key in dir(module_):
              if CONFIG_ATTR.match(key):
                  self[key] = getattr(module_, key)