<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def difference_update(self, *others):
 """Update the set, removing elements found in others."""

        self.db.sdiffstore(self.key, [o.key for o in [self.key] + others])