<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 async def ltrim(self, name, start, end):
 """ Trim the list ``name``, removing all values not within the slice between ``start`` and ``end`` ``start`` and ``end`` can be negative numbers just like Python slicing notation """

        return await self.execute_command('LTRIM', name, start, end)