Doing so would almost always be a serious mistake, however, because even when their return values are used in this way, list-related functions still modify their original argument.
但是这样做通常是一个严重的错误，因为即使它们返回的值以这种方式使用，与列表相关的函数仍然修改它们的原始参数。
You saw four examples of functions, to which you can extend, modify, and add new functions to help you better match your own requirements.
您看到了四个函数示例，您可以扩展、修改并添加新的函数以便帮助您更好地满足您自己的要求。
However, a skilled UNIX developer can also use XML functions to directly modify the file from within the program itself.
然而，有经验的UNIX开发人员还可以使用xml函数在程序中直接对文件进行修改。
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