<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_full_slice(obj, l):
 """ We have a full length slice. """

    return (isinstance(obj, slice) and obj.start == 0 and obj.stop == l and
            obj.step is None)