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 I/O 的輔助模組
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檔案 I/O 的輔助模組
「檔案」物件提供檔案 I/O 所需的最底限功能性，而某些輔助用的 Python
程式庫模組則提供便利的補充功能性，在幾種重要的情況中，讓 I/O 變得
更加容易且方便。
fileinput 模組
fileinput
模組讓你以迴圈處理文字檔案所成的一個串列（a list of text
files）中的所有文字行。效能良好，堪比在每個檔案上直接迭代的效能，
因為用了緩衝來最小化 I/O。因此，只要你覺得該模組豐富的功能性很方
便，你就能將模組
fileinput
用於資料行導向（line-oriented）的輸入，而
不用擔心效能。
input
函式是模組
fileinput
的關鍵函式；該模組也提供一
個
FileInput
類別，其方法提供與該模組的函式相同的功能性。該模組的內
容列於此：
close close()
關閉整個序列，讓迭代停止，並且沒有檔案仍然開啟。
FileInput class FileInput(files=None, inplace=False, backup='', bufsize=0,
openhook=None)
創建並回傳類別
FileInput
的一個實體
f
。引數與
fileinput.input
相同，
而
f
的方法與模組
fileinput
的函式有相同的名稱、引數和語意。
f
也提
供方法
readline
，它會讀取並回傳下一行。當你想要內嵌或混合會從多個
檔案序列讀取資料行的迴圈，你就可以明確地使用類別
FileInput
。
filelineno ...
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