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Python基础教程Python入门到精通全套day6_05-案例-判断是否存在
python基础学习课程，从搭建环境到判断语句，再到基础的数据类型，之后对函数进行学习掌握，熟悉文件操作，初步构建面向对象的编程思想，最后以一个案例带领同学进入python的编程殿堂
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