===== Code Pieces =====
[[https://python3-cookbook.readthedocs.io/zh_CN/latest/preface.html|python3-cookbook]]
  * [[pieces:python:不存在则创建目录]]
  * [[pieces:python:复制文件夹]]
  * [[pieces:python:日期操作]]
  * [[https://refactoringguru.cn/design-patterns/command/python/example|Python 命令模式讲解和代码示例]]