源代码： Lib/uu.py
This module encodes and decodes files in uuencode format, allowing arbitrary binary data to be transferred over ASCII-only connections. Wherever a file argument is expected, the methods accept a file-like object. For backwards compatibility, a string containing a pathname is also accepted, and the corresponding file will be opened for reading and writing; the pathname '-' is understood to mean the standard input or output. However, this interface is deprecated; it’s better for the caller to open the file itself, and be sure that, when required, the mode is 'rb' or 'wb' 在 Windows。
This code was contributed by Lance Ellinghouse, and modified by Jack Jansen.
The uu 模块定义了下列函数：
uuencode 文件 in_file into file out_file . The uuencoded file will have the header specifying name and mode as the defaults for the results of decoding the file. The default defaults are taken from in_file ，或 '-' and 0666 分别。
This call decodes uuencoded file in_file placing the result on file out_file 。若 out_file is a pathname, mode is used to set the permission bits if the file must be created. Defaults for out_file and mode are taken from the uuencode header. However, if the file specified in the header already exists, a uu.Error 被引发。
decode() may print a warning to standard error if the input was produced by an incorrect uuencoder and Python could recover from that error. Setting quiet to a true value silences this warning.
子类化的 Exception , this can be raised by uu.decode() under various situations, such as described above, but also including a badly formatted header, or truncated input file.
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