how to add elements of a list to another list code example

Example 1: add all items in list to another list python

a = [1]
b = [2,3]
a.extend(b)
print(a)

------  OR  -------
a += b

Example 2: append object python

>>> L = [1, 2, 3, 4]
>>> L.append(5)
>>> L
[1, 2, 3, 4, 5]