what does a one line for loop in python actually do code example

Example 1: one-line for loop python

[thing for thing in list_of_things]

Example 2: python for loop one line

>>> x = [1, 2, 3, 4, 5]
>>> y = [2*a for a in x if a % 2 == 1]
>>> print(y)
[2, 6, 10]