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>>> l1 = [1, 2, 3]
>>> l2 = [4, 5, 6]
>>> joined_list = [*l1, *l2] # unpack both iterables in a list literal
>>> print(joined_list)
[1, 2, 3, 4, 5, 6]
xxxxxxxxxx
l1 = [1, 2, 3]
l2 = [3, 2, 1]
l1.extend(l2)
print(l1)
# Result: [1, 2, 3, 3, 2, 1]