An element can be appended to a list L with the “+” operator:
L = L + [item]
Example:
>>> L = [3,4]
>>> L = L + [42]
>>> L
[3, 4, 42]
or
>>> L = [3,4]
>>> L += [42]
>>> L
[3, 4, 42]
Using append :
L.append(item)
Example:
>>> L = [3,4]
>>> L.append(42)
>>> L
[3, 4, 42]
Augmented Assignment