def list(self, **kwargs):
response, instances = self.request("<STR_LIT:GET>", self.uri, params=kwargs)<EOL>return [self.load_instance(r) for r in instances]<EOL>
Returns a list of :class:`MessagingStat` objects (messaging statistics).

:Example:

stats = client.stats_messaging.list()

:param str by:    Group results by specified period: `off`, `day`, `month` or `year`. Default is `off`.
:param str start: Start date in unix timestamp format. Default is 7 days ago.
:param str end:   End date in unix timestamp format. Default is now.