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ls = ["2021","123","Python"] ls.append([2021,"2021"]) ls.append(2021) print(ls)
['2021', '123', 'Python', 2021]
['2020', '123', 'Python', [2021, '2021']]
['2021', '123', 'Python', [2021, '2021'], 2021]
['2020', '123', 'Python', [2021], 2021]