how to add something to elements of a list code example

Example 1: add something to list python

#append to list
lst = [1, 2, 3]
something = 4
lst.append(something)
#lst is now [1, 2, 3, 4]

Example 2: how to add to a list python

a_list = [1,2,3]
a_list.append(4)