backup

《简明python教程》中备份文件的程序，在原有的程序基础上稍作修改程序可以在windows环境下运行，同时支持用户输入目标路径

Name		Name	Last commit message	Last commit date
Latest commit History 9 Commits
README.md		README.md
backup_ver1.py		backup_ver1.py
backup_ver2.py		backup_ver2.py
backup_ver3.py		backup_ver3.py
backup_ver4.py		backup_ver4.py

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