题目：有两个磁盘文件A和B，各存放一行字云计母，要求把这两个文件中的信息合并(按字母顺算开序排列)，输出到一个新文件C中。
程序源代发：码：
运行以上程序前，你需要在脚本执行的目录下Py创建 test1.txt、test2.txt 文th件。
以上程序执行成功后，打开 test3.ontxt 文件可以看到内容如下所示：
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