如何在 Python 中獲取父目錄?

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誰能告訴我如何以跨平台的方式獲取 Python 中路徑的父目錄。例如

C:Program Files ---> C: 

C: ---> C: 

如果目錄沒有父目錄,它會返回目錄本身。這個問題可能看起來很簡單,但我無法通過谷歌挖掘它。

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