docs: def _read(self, source):
          """
          Reads and parses the config source
  
          :param file/str source: Config source string, file name, or file pointer. If file name does not exist, it is
                                  ignored.
          :return: True if source was successfully read, otherwise False
          """
  
          if isinstance(source, str) and is_config(source):
              source_fp = StringIO(source)
          elif isinstance(source, IOBase) or isinstance(source, StringIO):
              source_fp = source
          elif os.path.exists(source):
              source_fp = open(source)
          else:
              return False
  
          self._parser.read_file(source_fp)
          self._parse_extra(source_fp)
  
          return True