A sequence like this will often be written either in square brackets [1, 2, 3, 4] (called a list) or in parentheses (1, 2, 3, 4) (a tuple).
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- 像这样的序列常常被放在中括号里[1,2,3,4](叫做一个列表)或者在圆括号里(1,2,3,4)(一个元组)。