def pexpire(self, name, time):
with self.pipe as pipe:<EOL><INDENT>return pipe.pexpire(self.redis_key(name), time)<EOL><DEDENT>
Set an expire flag on key ``name`` for ``time`` milliseconds.
``time`` can be represented by an integer or a Python timedelta
object.

:param name: str
:param time: int or timedelta
:return Future