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
timedelta
的實體支援算術運算（它的實體之間的，以及與類別
date
和
datetime
實體的
+
與
-
；與整數的
*
與
/
），以及實體之間的比較。v3 還支
援
timedelta
實體之間的除法（下取除法、真正的除法、
divmod
、
%
）。 實
體方法
total_seconds
回傳一個
timedelta
實體中的總秒數。
pytz 模組
第三方的
pytz
模組提供最佳、最簡單的方式來創建
tzinfo
實體，以製作類
別
time
與
datetime
能察覺時區的實體。（
pytz
以 Olson 時區程式庫為基礎
（
http://www.twinsun.com/tz/tz-link.htm
）。
pytz
，就像其他的第三方 Python
套件，可從PyPI（
https://pypi.python.org/pypi
）取得：只需
pip install
pytz
。）
處理時區
寫程式時避開時區常見陷阱的最佳方式是永遠都在內部使
用 UTC 時區，並在輸入時從其他時區轉換過來，顯示時再
轉換為其他時區。
pytz
提供屬性
common_timezones
，它是一個串列，列出了超過400 個
字串，指出你可能會想要使用的最常見的時區（大部分的形式都是
continent/city
，並有一些同義詞，像是
'UTC'
和
'US/Pacific'
）， 以 及
all_
timezones
，列出了超過 500 個字串的一個串列，其中還包含時區的其他同
義詞。舉例來說，要指定 Lisbon, Portugal（葡萄牙的里斯本）的時區 ...
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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.