str/list * num

a = [1, 2, 3]
b = 'abc'
print(a * 2)
print([a] * 3)
print(b * 3)
print([b] * 3)
print([[a]] * 3)

[1, 2, 3, 1, 2, 3]
[[1, 2, 3], [1, 2, 3], [1, 2, 3]]
abcabcabc
['abc', 'abc', 'abc']
[[[1, 2, 3]], [[1, 2, 3]], [[1, 2, 3]]]