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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第 21 章 Email、MIME 與其他網路編碼
將二進位資料編碼為 ASCII 文字
有數種媒體（例如電子郵件訊息）只能含有 ASCII 文字。當你想要透過這
種媒體傳送任意的二進位資料，你就得將那些資料編碼為 ASCII 文字字
串。Python 標準程式庫提供了模組支援標準的編碼，例如 Base64、Quoted
Printable 與 UU。
base64 模組
base64
模組支援 RFC 3548 中規範的編碼 Base16、Base32 與 Base64。這些
編碼中每個都是將任意二進位資料表示為 ASCII 文字的簡潔方式，而不會
嘗試產生人類可讀的結果。
base64
提供 10 個函式：Base64 的有 6 個，加
上 Base32 和 Base16 各 2 個。那 6 個 Base64 函式為：
b64decode b64decode(s,altchars=None, validate=False)
解碼 Base64 所編碼的位元組字串
s
，並回傳解碼後的位元組字
串。
altchars
，若不為
None
，就必須是至少兩個字元（其餘的字元
會被忽略）的一個位元組字串，指定兩個非標準的字元用來取代
+
和
/
（可用來處理具 URL 安全性或檔案系統安全性的 Base64 編
碼字串）。
validate
只能在 v3 中傳入：若為
True
，當
s
含有的任
何位元組不是有效的 Base64 編碼字串，此呼叫會提出一個例外
（預設情況中，這種位元組單純會被忽略並跳過）。如果
s
沒有依
據 Base64 ...
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