最后，本文介绍了将这个经过修改的配置文件写入到磁盘的代码。
Lastly, it presents the code for writing the changed configuration file out to disk.
打开写入磁盘的文件并检查它包含的数据（参见图 21）。
Open the file that was written to disk and examine the data it contains (see figure 21).
在 GAE 上，您是无法将文件写入到磁盘的，因为 GAE 根本没有可用的文件系统。
In GAE, you can't write files to disk because there's no useable file system.
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