how do you pick every other number in python code example

Example 1: every second value python

import numpy as np
values=np.arange(0,10)
print(values[::2])

Example 2: python every other goes to a list

a = [1, 2, 3, 4, 5]
a[1::2]
# returns 2, 4
a[::2]
#returns 1, 3, 5