【填空题】
163、 表达式 ‘Hello world!’[-4] 的值为______。___
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答案
’r’
解析
暂无解析
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【填空题】
185、 已知 x = [1, 2, 3]，那么执行语句 x[len___-1:] = [4, 5, 6]之后，变量x的值为_______________________。___
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