code: def from_bytes(value):
      
      result = (value.decode('utf-8')
                if isinstance(value, six.binary_type) else value)
      if isinstance(result, six.text_type):
          return result
      else:
          raise ValueError(
              '{0!r} could not be converted to unicode'.format(value))
docs: Converts bytes to a string value, if necessary.
  
      Args:
          value (Union[str, bytes]): The value to be converted.
  
      Returns:
          str: The original value converted to unicode (if bytes) or as passed in
              if it started out as unicode.
  
      Raises:
          ValueError: If the value could not be converted to unicode.