code: def getAttributeValue(self, index):
          
          offset = self._get_attribute_offset(index)
          valueType = self.m_attributes[offset + ATTRIBUTE_IX_VALUE_TYPE]
          if valueType == TYPE_STRING:
              valueString = self.m_attributes[offset + ATTRIBUTE_IX_VALUE_STRING]
              return self.sb[valueString]
          return ''
docs: This function is only used to look up strings
          All other work is done by
          :func:`~androguard.core.bytecodes.axml.format_value`
          # FIXME should unite those functions
          :param index: index of the attribute
          :return: