code: def get_attribute(attribute_uri):
          
          attribute_value = get_request(_GCP_METADATA_URI + attribute_uri,
                                        _GCP_METADATA_URI_HEADER)
  
          if attribute_value is not None and isinstance(attribute_value, bytes):
              # At least in python3, bytes are are returned from
              # urllib (although the response is text), convert
              # to a normal string:
              attribute_value = attribute_value.decode('utf-8')
  
          transformation = _ATTRIBUTE_URI_TRANSFORMATIONS.get(attribute_uri)
          if transformation is not None:
              attribute_value = transformation(attribute_value)
  
          return attribute_value
docs: Fetch the requested instance metadata entry.
          :param attribute_uri: attribute_uri: attribute name relative to the
          computeMetadata/v1 prefix
          :return:  The value read from the metadata service or None