Also note that class definitions must appear at the top level of a module, meaning they cannot be nested classes (classes defined inside other classes or functions).

另外要注意，类定义必须出现在模块的最顶层，这意味着它们不能是嵌套的类(在其它类或函数中定义的类)。

youdao

Also note that class definitions must appear at the top level of a module, meaning they cannot be nested classes (classes defined inside other classes or functions).

另外要注意，类定义必须出现在模块的最顶层，这意味着它们不能是嵌套的类(在其它类或函数中定义的类)。

youdao