' r '(默认值)表示从文件读取数据。
'r' (the default) indicates that you want to read data from the file.
编写程序的最后一个基本步骤就是从文件读取数据和把数据写入文件。
The last basic step involved in writing programs is to read data from and write data to a file.
这篇文章讨论了在Python程序中如何从文件读取数据和写入数据到文件中。
This article discussed how to read and write data to a file from a Python program.
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