January 2018
Intermediate to advanced
856 pages
17h 17m
Chinese
Content preview from Python 技術手冊 第三版
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檔案系統作業
|
351
測試時會比較快：它們只需要在一系列測試的開頭呼叫一次
os.start
，而
os.path
中的函式則會在每次測試都隱含地向作業系統詢問相同的資訊。每
個函式都會在
mode
代表給定種類的檔案時回傳
True
，否則回傳
False
。
S_ISDIR(mode)
檔案是一個目錄嗎？
S_ISCHR(mode)
檔案是字元（character）類型的特殊裝置檔案（device-file）嗎？
S_ISBLK(mode)
檔案是區塊（block）類型的特殊裝置檔案嗎？
S_ISREG(mode)
檔案是一個普通檔案（不是目錄、特殊裝置檔或其他）嗎？
S_ISFIFO(mode)
檔案是一個 FIFO（也稱為「具名管線」，「named pipe」）嗎？
S_ISLNK(mode)
檔案是一個符號連結（symbolic link）嗎？
S_ISSOCK(mode)
檔案是一個 Unix-domain socket 嗎？
這些函式中有數個只在類 Unix 系統上有意義，因為其他的平台並沒有將
特殊檔案（例如裝置或 sockets）放在一般檔案的命名空間（namespace）
中，跟類 Unix 系統不同。
stat
模組提供另外兩個函式，可用來擷取一個檔案的
mode
（
x.st_mode
，
x
是函式
os.stat
的某個結果）中相關的部分：
S_IFMT S_IFMT(mode)
回傳
mode
中描述檔案種類的那些位元（也就是，
S_ISDIR
、
S_ISREG
等函式
所檢視的那些位元）。
S_IMODE S_IMODE(mode
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.