<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def trim(self, count, approximate=True):
 """ Trim the stream to the given "count" of messages, discarding the oldest messages first. :param count: maximum size of stream :param approximate: allow size to be approximate """

        return self.database.xtrim(self.key, count, approximate)