Python是这样处理的——不强制数据隐藏、成员可见、继承需求和类似的做法，而是遵从在何时完成的规范。
That's the Python way — not to enforce data hiding, member visibility, inheritance requirements, and the like, but simply to follow polite conventions about when these things should be done.
这些文件是样例XML文件，可用于测试我们的程序而无须强制数据库错误或使用Optim Performance Manager。
These are sample XML files that can be used to test our program without having to force database errors or use Optim Performance Manager.
CAST函数被调用两次，以将输入参数的值(针对城市和州)强制转换适当的数据类型。
The cast function is called twice to cast the values of the input parameters (for city and state) to appropriate data types.
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