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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文字輸入與輸出
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359
O_APPEND
將新的資料附加（append）到
file
之前的內容後
O_DSYNC O_RSYNC O_SYNC O_NOCTTY
如果平台支援的話，就據此設定同步（synchronization）模式
O_CREAT
如果
file
尚未存在，就創建
file
O_EXCL
如果
file
已經存在，就提出一個例外
O_TRUNC
丟棄
file
之前的內容（與
O_RDONLY
不相容）
O_BINARY
在非類 Unix 平台上以二進位模式開啟
file
而非文字模式（在類 Unix
平台上沒有效果，是無害的）
pipe pipe()
建立一個管線（pipe），並回傳一個檔案描述器對組
(r, w)
，分別是
開啟用於讀取和寫入。
read read(fd, n)
從檔案描述器
fd
回傳最多
n
個位元組，並將它們回傳為一個 bytestring
（位元組字串）。如果檔案目前可讀取的剩餘位元組只有
m
個，就會讀取
並回傳
m<n
個位元組。特別是，如果檔案目前已經沒有更多的位元組可
讀，就回傳空字串，通常是因為檔案已經結束了。
write write(fd, s)
將 bytestring
s
的所有位元組寫入檔案描述器
fd
，並回傳所寫入的位元組
數（即
len(s)
）。
文字輸入與輸出
Python 以「檔案」物件的形式為你的程式提供非 GUI 的文字輸入與輸出管
道，所以你可以使用「檔案」物件（涵蓋於前面的「「檔案」物件的屬性
與方法」中）的方法操作這些管道。
360
|
第 10 章 檔案與文字作業
標準輸出與標準錯誤
sys
模組
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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.