code: def read(self, user=True, defaults=True):
          
          if user:
              self._add_user_source()
          if defaults:
              self._add_default_source()
docs: Find and read the files for this configuration and set them
          as the sources for this configuration. To disable either
          discovered user configuration files or the in-package defaults,
          set `user` or `defaults` to `False`.