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 12 章 時間作業
timezone timezone
本地時區（沒有 DST）與 UTC 的偏移量（在美洲
>0
；在大部分的歐洲、
亞洲和非洲則
<=0
），以秒為單位。
tzname tzname
一對取決於 locale 的字串，分別是帶有及不帶有 DST 的本地時區名稱。
a
mktime
結果的小數部分永遠為 0，因為它的 timetuple 引數並不計入小數的秒數。
datetime 模組
datetime
提供類別來建立日期與時間物件，它們可以是能
察覺
（
aware
）
時區的，或
無知
（
naive
）的（預設值）。其實體代表時區的類別
tzinfo
是
抽象的：模組
datetime
不提供實作（細節請參閱線上文件（
https://docs.
python.org/3/library/datetime.html#tzinfo-objects
））。
tzinfo
的良好、簡單的
實作，請參閱模組
pytz
（涵蓋於後面的「pytz 模組」），它可以讓你輕易地
創建能察覺時區的
datetime
物件。
datetime
中的所有型別都有不可變的實
體（immutable instances）：屬性是唯讀的，而實體可以是一個
dict
中的鍵
值，或一個
set
中的項目。
date 類別
date
類別的實體代表一個日期（該日期中沒有當日時間），永遠都是原生
的，並假設用的是公曆（Gregorian calendar）。
date
實體有三個唯讀的整
數屬性：
year
、
month
與
day
：
date date(year,month,day
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