【填空题】
256、 Python标准库os.path中用来判断指定文件是否存在的方法是____。___）
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答案
exists(
解析
暂无解析
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【填空题】
295、 已知有列表 x = [[1, 2, 3], [4, 5, 6]]，那么表达式 [[row[i] for row in x] for i in range___)] 的值为_________________。___
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