题目内容

下面代码的输出结果是 list1=[(m,n)formin'ABC'fornin'ABC'ifm!=n] print(list1)

A. [('A','B'),('A','C'),('B','A'),('B','C'),('C','A'),('C','B')]
B. ['AC','AD','BC','BD']
C. 错误
D. [('A','C'),('A','D'),('B','C'),('B','D')]

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将以下代码保存成Python文件，运行后输出的是 li=['alex','eric','rain'] s="_".join(li) print(s)

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