code: def _decode_module_id(self, module_id):
          
          name = [''] * 9
          module_id >>= 10
          for i in reversed(range(9)):
              name[i] = self.charset[module_id & 63]
              module_id >>= 6
          return ''.join(name)
docs: decode module id to string
          based on @antirez moduleTypeNameByID function from redis/src/module.c
          :param module_id: 64bit integer
          :return: string