Python equivalent of Ruby's .select

Question

I have an list/array, lets call it x, and I want to create a new list/array, lets call this one z, out of elements from x that match a

Answer 1

Using a list comprehension is considered "Pythonic":

x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
z = [i for i in x if i < 5]
print z

Output

[1, 2, 3, 4]