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题目：两个变量值互换。 程序分析：通过if云计判断执行“__mian__。 __name__是一个算开变量。前后加了爽下划线是因为是因为这是系统定义发：的名字。普通变量不要使用此方式命名变量。__nPyame__就是标识模块的名字的一个系统变量th。这里分两种情况：假如当前模块是主模块(也就是on调用其他模块的模块)，那么此模块名字就是练习__main__，通过if判断这样就可以执实例行“__mian__:”后面的主函数内容；-两假如此模块是被import的，则此模块名字为文件个变名字(不加后面的.py)，通过if判断这量值样就会跳过“__mian__:”后面的内互换容。 程序源代码： 以上实例输出结果为： |
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