<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def move(self, filename, target):
        '''
        Move a file given its filename to another path in the storage

        Default implementation perform a copy then a delete.
        Backends should overwrite it if there is a better way.
        '''
        self.copy(filename, target)
        self.delete(filename)