Test array

>>> arr = [0, 5, 10, 50, 100]

Create a new list with the values doubled

>>> [x*2 for x in arr]
[-8, -4, 0, 4, 8]

Filter the list

>>> [x for x in arr if x > 10]
[50, 100]

Apply a function to each element

>>> [divmod(x, 20) for x in arr]
[(0, 0), (0, 5), (0, 10), (2, 10), (5, 0)]