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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os 模組
|
339
zlib 模組
zlib
模組能讓 Python 程式使用免費的 InfoZip
zlib
壓縮程式庫（
http://www.
info-zip.org/pub/infozip/
）1.1.4 或之後版本。
zlib
由模組
gzip
與
zipfile
所
用，但也能直接用於任何特殊的壓縮需求。
zlib
所提供的最常用的函式
有：
compress compress(s, level=6)
壓縮字串
s
並回傳經過壓縮的資料所成的字串。
level
是介於
1
與
9
之間
的一個整數：
1
請求一般的壓縮，但作業速度會比較快，而
9
請求最佳的
壓縮，但會耗費更多的計算成本。
decompress decompress(s)
解壓縮經過壓縮的 bytestring
s
，並回傳未壓縮的資料所成的 bytestring
（也接受選擇性的引數用於相當進階的功能，參閱線上文件（https://docs.
python.org/3/library/zlib.html?highlight=zlib#zlib.decompress））。
zlib
模組也提供函式用來計算 CRC（Cyclic-Redundancy Check，循環冗
餘校驗），它能用來偵測壓縮過的資料和要壓縮的物件中的毀損，並能夠
漸進式地解壓縮資料，以處理太大無法一次放入記憶體中的資料流。對於
這種進階的功能性，請查閱 Python 程式庫的線上文件（
https://docs.python.
org/3/library/zlib.html
）。
os 模組
os
是一個集成模組
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