为什么会发生错误?

Why does the error occur?

看来您自己找到了答案:

It seems you found the answer yourself:

import 语句似乎需要常规字符串

The import statement seems to require a regular string

完全正确. import 需要一个字符串 literal .导入位置不能是动态的.

Exactly. import needs a string literal. It import location cannot be dynamic.

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