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file:简明python教程.pdf file:《Python标准库》中文版.pdf file:python核心编程中文版（第二版）.pdf
file:017-文件和输入输出01.avi file:016-条件和循环02-练习题和生成器.avi file:012-序列04-02.avi file:011-del和getattr.avi