code: def psetex(self, name, time_ms, value):
          
          if isinstance(time_ms, datetime.timedelta):
              time_ms = int(time_ms.total_seconds() * 1000)
          return self.execute_command('PSETEX', name, time_ms, value)
docs: Set the value of key ``name`` to ``value`` that expires in ``time_ms``
          milliseconds. ``time_ms`` can be represented by an integer or a Python
          timedelta object