how to remove every item except last in list python code example

Example 1: remove last element from list python

>>> l = list(range(1,5))
>>> l
[1, 2, 3, 4]
>>> l.pop()
4
>>> l
[1, 2, 3]

Example 2: exclude last value of an array python

my_array=np.arange(10)
my_array[:-1]