单项选择题
已知字符串s="abc",则表达式s*2的值是()
A."abcabc"
B.abcabc
C."abc2"
D."aabbcc"
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单项选择题
以下哪个标识符能用于在Python程序中自定义变量名()
A.True
B.While
C.import
D.if
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单项选择题
执行表达式2+ 1a 后,结果为()
A.3
B."21a"
C."21"
D.报错
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